PDF Infinity Causation and Paradox Alexander R Pruss Ebook Full Chapter
PDF Infinity Causation and Paradox Alexander R Pruss Ebook Full Chapter
PDF Infinity Causation and Paradox Alexander R Pruss Ebook Full Chapter
Alexander R Pruss
Visit to download the full and correct content document:
https://textbookfull.com/product/infinity-causation-and-paradox-alexander-r-pruss/
More products digital (pdf, epub, mobi) instant
download maybe you interests ...
https://textbookfull.com/product/biota-grow-2c-gather-2c-cook-
loucas/
https://textbookfull.com/product/necessary-existence-alexander-r-
pruss/
https://textbookfull.com/product/infinity-kings-infinity-
cycle-3-1st-edition-adam-silvera/
https://textbookfull.com/product/infinity-reaper-infinity-
cycle-2-1st-edition-adam-silvera/
The Energy Paradox What to Do When Your Get Up and Go
Has Got Up and Gone The Plant Paradox 5th Edition
Steven R. Gundry
https://textbookfull.com/product/the-energy-paradox-what-to-do-
when-your-get-up-and-go-has-got-up-and-gone-the-plant-
paradox-5th-edition-steven-r-gundry/
https://textbookfull.com/product/abstraction-and-infinity-1st-
edition-paolo-mancosu/
https://textbookfull.com/product/abstraction-and-infinity-1st-
edition-paolo-mancosu-2/
https://textbookfull.com/product/infinity-reaper-1st-edition-
adam-silvera/
https://textbookfull.com/product/infinity-reaper-2020th-edition-
adam-silvera/
OUP CORRECTED PROOF – FINAL, 19/6/2018, SPi
Infinity, Causation,
and Paradox
Alexander R. Pruss
1
OUP CORRECTED PROOF – FINAL, 19/6/2018, SPi
3
Great Clarendon Street, Oxford, OX2 6DP,
United Kingdom
Oxford University Press is a department of the University of Oxford.
It furthers the University’s objective of excellence in research, scholarship,
and education by publishing worldwide. Oxford is a registered trade mark of
Oxford University Press in the UK and in certain other countries
© Alexander R. Pruss 2018
The moral rights of the author have been asserted
First Edition published in 2018
Impression: 1
All rights reserved. No part of this publication may be reproduced, stored in
a retrieval system, or transmitted, in any form or by any means, without the
prior permission in writing of Oxford University Press, or as expressly permitted
by law, by licence or under terms agreed with the appropriate reprographics
rights organization. Enquiries concerning reproduction outside the scope of the
above should be sent to the Rights Department, Oxford University Press, at the
address above
You must not circulate this work in any other form
and you must impose this same condition on any acquirer
Published in the United States of America by Oxford University Press
198 Madison Avenue, New York, NY 10016, United States of America
British Library Cataloguing in Publication Data
Data available
Library of Congress Control Number: 2018939478
ISBN 978–0–19–881033–9
Printed and bound by
CPI Group (UK) Ltd, Croydon, CR0 4YY
Links to third party websites are provided by Oxford in good faith and
for information only. Oxford disclaims any responsibility for the materials
contained in any third party website referenced in this work.
OUP CORRECTED PROOF – FINAL, 19/6/2018, SPi
Contents
List of Figures xi
Acknowledgments xiii
vi contents
contents vii
viii contents
contents ix
References 195
Index 201
OUP CORRECTED PROOF – FINAL, 19/6/2018, SPi
OUP CORRECTED PROOF – FINAL, 19/6/2018, SPi
List of Figures
All illustrations in this volume have been compiled by the author.
1.1 Thomson’s Lamp 1
1.2 Correspondence between natural numbers and even natural numbers 5
1.3 Interval notation 6
2.1 The two ways of violating causal finitism: regress (left) and infinite
cooperation (right) 25
2.2 The testimony of unicorn experts 28
2.3 A theistic non-vicious regress? 33
2.4 Here, I1 = {a1 , a2 , a3 }, L1 = {e, a1 , a2 , a3 }, and M2 = {a4 , a5 , . . . } 38
3.1 Some representative Grim Reaper activations 47
3.2 Some representative reversed Grim Reaper activations 48
3.3 Smullyan’s rod with exponentially decreasing density and hence
exponentially decreasing quasi-gravitational pull 58
4.1 A lucky case where the lottery works, with the winner being the number 2 79
4.2 A traverse of a two-dimensional array 80
6.1 The (i)–(ii) betting portfolio that you should be happy to pay a dollar
for. The volume of each sphere is 1/100th of that of the cube 126
6.2 The (i )–(ii )
betting portfolio that you should be happy to pay a dollar
for if the argument works 127
6.3 The (i )–(ii ) betting portfolio you should be happy to accept for free 128
6.4 A slice of a Choice Machine 132
7.1 Benardete’s Boards 147
7.2 Four paradigmatic violations of (8) 163
OUP CORRECTED PROOF – FINAL, 19/6/2018, SPi
OUP CORRECTED PROOF – FINAL, 19/6/2018, SPi
Acknowledgments
I am especially grateful to Ian Slorach who gave me many very insightful and helpful
comments and criticisms both on my blogged arguments before I started writing this
book and while I was committing material to the book draft’s GitHub repository. I am
also particularly grateful to Miguel Berasategui, Blaise Blain, Trent Dougherty, Kenny
Easwaran, Richard Gale, Alan Hájek, James Hawthorne, Robert Koons, Jonathan
Kvanvig, Arthur Paul Pederson, Philip Swenson, and Josh Rasmussen. I am very
grateful to other readers of my blog as well as to my audiences at Baylor University,
Catholic University of America, University of Oklahoma, and the “New Theists”
workshop for their patience as I tried out versions of these arguments, and for their
critical commentary. Moreover, I am greatly in the debt of a number of anonymous
readers of this manuscript whose careful reading has resulted in much improvement
of the book. The remaining obscurities are my own accomplishment. Finally, I am very
grateful to Christopher Tomaszewski for his careful work on indexing this volume.
OUP CORRECTED PROOF – FINAL, 19/6/2018, SPi
OUP CORRECTED PROOF – FINAL, 14/6/2018, SPi
1
Infinity, Paradox, and Mathematics
Finally, I will consider two potential consequences of causal finitism. That a theory
has consequences beyond what it was intended to explain gives some reason to think
the theory is not ad hoc. At the same time, such consequences make the theory more
vulnerable to refutation, since there might be arguments against the consequences.
The first apparent consequence is that time, and perhaps space as well, is discrete.
If this does indeed follow, that is intrinsically interesting, but also damaging to causal
finitism in that it appears to conflict with much of physics since Newton. We shall
consider whether the discreteness of time actually follows and whether the kind of
discreteness that is supported by causal finitism is in fact in conflict with physics, and
argue that causal finitism can cohere with modern physics.
The second consequence is clearer. If causal finitism is true, then there cannot be
backwards-infinite causal sequences, and hence there must be at least one uncaused
cause. There is also some reason to take this uncaused cause to be a necessary being.
Now the most prominent theory on which there is a causally efficacious necessary
being is theism. Thus, causal finitism lends some support to theism. Interestingly, this
will force us to consider whether theism doesn’t in turn undercut causal finitism.
I will occasionally use the convenient phrase “causal infinitism” for the negation of
causal finitism. Roughly, thus, causal infinitism holds that it is possible for something
to have an infinite causal history. (Note that causal infinitism does not say that there
actually is any infinite causal history.) Thus the point of the book is to argue for causal
finitism or, equivalently, to argue against causal infinitism.
Let me end this section by noting that I do not take Thomson’s Lamp to be a
particularly compelling version of a paradox motivating causal finitism. There will
be more discussion of it in Chapter 3, Section 2. But it is a helpful stand-in for many
of the more complicated paradoxes we will consider.
We can compare the cardinal sizes of sets as follows. If there is a way of assigning a
different member of B to every different member of a set A (i.e., if there is a one-to-one
function from A to a subset of B), then we say that A ≤ B, i.e., the cardinality of
A is less than or equal to that of B. For instance, if B is the set of real numbers between
0 and 1 inclusive, and A is the set of positive integers, then to every member n of A we
can assign the member 1/n of B (note that if n and m are different members of A, then
1/n and 1/m are different members of B).
We say that A has fewer members than B, and we write A < B, provided that
A ≤ B but not B ≤ A. We say that sets A and B have the same cardinality
when A ≤ B and B ≤ A. The famous Schröder–Bernstein Theorem (Lang
2002, p. 885) says that under those conditions there is a one-to-one pairing of all the
members of A with all the members of B.
Some sets are finite and some are infinite. A set is finite if it is empty or has the
same size as some set of the form {1, . . . , n} for a positive integer n. Otherwise, the set
is infinite.
Infinite sets are in some ways like finite sets and in others unlike them. Both their
likeness and their unlikeness to finite sets are counterintuitive to many people.
A way in which infinite sets differ from finite ones is that if A and B are finite sets
with A a proper subset of B, then A always has fewer members than B. But infinite
sets have proper subsets of the same size as themselves.3 For instance, if B is the
set {0, 1, 2, . . .} of natural numbers, then the proper subset A = {0, 2, 4, . . .} of even
naturals has the same size as B, as can be seen by joining them up one by one as in
Fig. 1.2.
On the other hand, just as the finite sets differ among each other in size, Georg
Cantor discovered that so do the infinite ones, if size is defined as above. The difference
in size between infinite sets is harder to generate, however. Simply adding a new
member to an infinite set doesn’t make for a larger infinite set. But given a set A,
we can also form the powerset P A of all the subsets of A. And it turns out that P A
always has strictly more members than A—this is now known as Cantor’s Theorem.4
0 1 2 3 4
0 2 4 6 8
Fig. 1.2 Correspondence between natural numbers and even natural numbers.
3 ∗∗ To be precise, this is only true for all Dedekind-infinite sets. If the Countable Axiom of Choice is
false, then there may be infinite sets that aren’t Dedekind-infinite (Jech 1973, p. 81). But standard examples
of infinite sets, such as the natural or real numbers, are still Dedekind-infinite. For simplicity, I will write
as if all infinite sets were Dedekind-infinite.
4 Here is a proof. It’s clear that P A has at least as many members as A does, since for each member
x of A, the singleton {x} is a member of P A. So all we need to show is that A does not have at least as many
members as P A. For a reductio, suppose there is a function f that assigns a different member f (B) of A
OUP CORRECTED PROOF – FINAL, 14/6/2018, SPi
If A is finite and has n members, then P A will have 2n members (for we can generate
all the members of P A by considering the 2n possible combinations of yes/no answers
to the questions “Do I include a in the subset?” as a ranges over the members
of A), and n < 2n . But the Cantorian claim applies also to infinite sets: in general,
A < P A.
In particular, there is no largest set. For if A were the largest set, then P A would be
yet larger, which would be a contradiction.
Sets which are finite or the same size as the set of natural numbers {0, 1, 2, . . .},
which will be denoted N, are called countable. An example of an uncountable set
is P N. Another is the set R of real numbers, which in fact has the size as P N.
A useful notation for certain sets of real numbers is given by [a, b], (a, b), [a, b),
and (a, b] (see Fig. 1.3). Each of these denotes an interval from a to b, with the square
brackets indicating that the endpoint is included in the interval and the parenthesis
indicating that it’s not. Thus [a, b] is the set of all real numbers x such that a ≤ x ≤ b,
(a, b) is the set of all reals x such that a < x < b, [a, b) is the set of all reals x such that
a ≤ x < b and (a, b] is the set of all reals x such that a < x ≤ b. As long as a < b, all
the four intervals are uncountably infinite and of the same size as R.
Finally, it will sometimes be convenient to talk in terms of pluralities. When I say
(1) The members of my Department get along with each other
the grammatical subject of (1) is a plurality, the members of my Department. The verb
form that agrees with that plurality, “get”, is in a plural conjugation. The subject of the
sentence is not a singular object like the set of the members of my Department or
some sort of a mereological sum or fusion of the members, for that would call for a
singular verb, and it would make no sense to say that that singular object “get along
with each other”.
We can quantify over pluralities. We can, for instance, say that for any plurality of
members of my Department, the xs, there is a plurality, the ys, of people in another
Department such that each of the xs is friends with at least two of the ys. Plural
quantification is widely thought to avoid ontological commitment to sets. It also
avoids technical difficulties with objects that do not form a set. There is no set of all
sets, but it makes sense to plurally quantify and say that all the sets are abstract objects.
to every different member B of P A. Let D be the set of all members x of A that are assigned by f to some
set B such that x is not a member of B, i.e., D = {x ∈ A : ∃B(x = f (B) & x ∈ / B)}. Let x = f (D). Note
that x is a member of D if and only if there is a subset B of A such that f (B) = x and x is not a member of
B. The only possible candidate for a subset B of A such that f (B) = x is D, since f assigns x to D and will
assign something different from x to a B different from D. Thus, x is a member of D if and only if x is not a
member of D, which is a contradiction.
OUP CORRECTED PROOF – FINAL, 14/6/2018, SPi
modality
I will assume that pluralities have their elements rigidly. That is, if x0 is one of the xs,
then in any possible world where the xs exist, x0 exists and is one of the xs.
3. Modality
3.1 Metaphysical possibility and necessity
Fairies and water made of carbon atoms have something in common: they don’t exist.
But there the similarity ends. For although neither is actual, the fairy is possible, while
the water made of carbon atoms is not.
The kind of possibility at issue here is not merely logical. No contradiction can be
proved from the existence of a fairy, but also no contradiction can be proved from the
existence of carbon-based water. In each case, empirical work is needed to know the
item does not exist.
There are many theories of the nature of modality.5 The arguments of this book
are not tied to any particular such theory, but rather to intuitive judgments about
cases. These intuitive judgments about cases may themselves put constraints on which
theory of modality is plausible, though of course the reader will also find her theory of
modality affecting what to think about the cases. That is a part of why I give so many
paradoxical cases in this book: some cases may appeal to some readers while others
to others.
3.2 Rearrangement principles
.. defeasibility
If it is metaphysically possible to have one horse and two donkeys in a room,
intuitively it’s possible to have two horses and one donkey in a room as well. Lewis
(1986, Section 1.8) attempted to formulate a “rearrangement principle” that justifies
inferences such as this (see Koons 2014 for some more rigorous formulations). The
basic idea behind rearrangement principles is that:
(2) Given a possible world with a certain arrangement of non-overlapping spatio-
temporal items, any “rearrangement” of these items that changes the quan-
tities, positions, and orientations to some other combination of quantities,
positions, and orientation that is geometrically coherent and non-overlapping
is also metaphysically possible.
Unrestricted rearrangement principles sit poorly with causal finitism. Just multiply
the number of button flippings and you go from an ordinary bedside lamp being
turned off at night and on in the morning to Thomson’s paradoxical lamp. And even
if we restrict changes in quantity to be finite, an innocent forwards-infinite causal
sequence can be transformed into a backwards-infinite one.
5 In Pruss (2011) I defend a causal powers account of modality, but nothing in the present book depends
on that defense.
OUP CORRECTED PROOF – FINAL, 14/6/2018, SPi
Nonetheless, many of our arguments for causal finitism will depend on rearrange-
ment considerations. Isn’t that cheating?
To see our way to a negative answer, observe that unrestricted rearrangement prin-
ciples carry many heavy metaphysical commitments. They rule out classical theism,
since on classical theism God is a necessary being, and a situation that could coexist
with God could be rearranged, say by greatly multiplying evils and removing goods,
into a situation that couldn’t coexist with God (cf. Gulesarian 1983). They give an
argument for the possibility of a universe consisting of a single walnut that comes
into existence at some time, and hence for the possibility of something coming from
nothing. They rule out Aristotelian theories of laws and causation on which the
exercises of causal powers necessitate their effects in the absence of counteracting
causes. They sit poorly with the essentiality of evolutionary origins for biological
natural kinds and with the essentiality of origins for individuals. And they even rule
out certain colocationist theories of material objects. For colocationists will say that
wherever you have a clay statue you also have a lump of clay, but an unrestricted
rearrangement principle should let you have the clay statue without the lump!
Even philosophers of a Humean bent who are uncomfortable with theism and
essentiality of origins and have no problems with things coming into being ex nihilo
need to restrict rearrangement on metaphysical grounds. For instance, Lewis (1986,
p. 89) said that all rearrangements are possible “size and shape permitting”. The worry
is that it might turn out that material objects cannot interpenetrate, so one cannot
rearrange a world with a horse standing beside a cow into a world where they occupy
the same location. This seemingly purely geometrical constraint in fact needs to
depend on the metaphysics of the material objects in question. Perhaps indeed a horse
and a cow could not occupy the same location, but we have good reason to think that
multiple bosons like photons can occupy the same location, since two bosons can have
the same quantum state (Dirac 1987, p. 210). So what the “size and shape permitting”
constraint comes to depends on the metaphysics of the objects, namely whether they
can be colocated.
Thus, rearrangement principles like (2) should be curtailed in some way lest they
ride roughshod over too much metaphysics. One way to do this is to extend Lewis’s
strategy by giving a list of specific metaphysical constraints like his “size and shape
permitting”. But it is difficult to see how we could ever be justified in thinking that
our list of constraints is complete.
A better way is to stipulate that the rearrangement principles are defeasible, with the
understanding that it is best if defeaters for rearrangement principles are principled
rather than ad hoc. Theism, Aristotelian views of causation, essentiality of origins,
or causal finitism could each provide principled defeaters to particular cases of
rearrangement. But if one ruled out Thomson’s Lamp by saying that this particular
rearrangement of the ordinary bedside lamp situation is impossible, that would be
ad hoc. If, instead, we could rule out Thomson’s Lamp as well as a number of other
paradoxes by means of a single general principle, namely causal finitism, that would
be highly preferable. And it is this that is the strategy of the present book.
OUP CORRECTED PROOF – FINAL, 14/6/2018, SPi
modality
6 Of course, in a degenerate way, Parmenides was a finitist, as he thought that there could be only
one thing.
7 There is also a variant by Diekemper (2014) that includes only the past. That variant will not be helpful
to the finitist, and I will stick to the canonical version that includes the present.
OUP CORRECTED PROOF – FINAL, 14/6/2018, SPi
This leaves growing block plus finitism. If it’s necessarily true that a cause is earlier
than or simultaneous with its effect, then growing block finitism does entail causal
finitism, and hence can rule out all the paradoxes that causal finitism can. Given the
combination of (a) growing block theory, (b) finitism, and (c) the thesis that causes are
either temporally prior to or simultaneous with their effects, we do get causal finitism
again, and hence we can rule out all the paradoxes that causal finitism can rule out.
The finitist’s best bet at paradox removal is thus to adopt growing block together
with the thesis that causes are prior to or simultaneous with their effects.
Unfortunately, there is a powerful argument against growing block theory due
to Merricks (2006). Many people have thought thoughts about what date or time
it is, thoughts expressible in sentences like: “It is now 2012” or “It is now noon.”
If growing block theory is true, many of these thoughts are in the past, and most
have a content that is objectively false. On the growing block theory, the “now”
is the leading edge of reality, the boundary between the real and the unreal. The
thought expressed by “It is now 2012” is true if and only if 2012 is at the leading
edge of reality. But 2012 is not at the leading edge of reality. Moreover, my present
thought that it is now 2018 has no better evidence than the “It is now 2012” thought
that was in 2012. Since most thoughts of this sort, with the usual sort of evidence
for them, are false, I should be skeptical about whether it is now 2018. And that’s
absurd. Presentism escapes this argument by denying that the past thoughts exist.
Moving spotlight versions of eternalism, on which there is something like an objective
“moving spotlight” illuminating the “now” are also subject to this objection: most of
the “It is now t” thoughts are not illuminated by the spotlight, and yet “now” implies
such “illumination”. But B-theoretic eternalism (e.g., Mellor 1998), which claims that
the “now” is a mere indexical, rather than an expression of an objective changing
property (like being at the leading edge of reality or being “illuminated”), is not subject
to the objection. Hence, the finitist’s best bet at paradox removal requires adopting a
particularly vulnerable theory of time.
We now consider more advantages and disadvantages of finitism vis-à-vis causal
finitism as a way out of paradoxes.
4.2 Non-causal paradoxes: An advantage?
Imagine Hilbert’s Hotel—a hotel with infinitely many rooms numbered 1, 2, 3, . . . .
You can have lots of fun with that. Put a person in every room, and then hang up the
sign: “No vacancy. Always room for more.”8 When a new customer asks for a room,
just put them in room 1, and tell them to tell the person in the room to move to
the next room, and to pass on the same request. You can even have infinitely many
people vacate the hotel and still have it full. If all the people in the odd-numbered
rooms leave, you can tell each person in the even-numbered rooms to move to a room
whose number is half of their room number.
8
The sign suggestion comes from Richard Gale.
OUP CORRECTED PROOF – FINAL, 14/6/2018, SPi
While the stories I gave involved causation, that was only for vividness. To see
the paradoxicality, all we need to notice is that the guests can move around (even
causelessly, if that’s possible) to make space for a new guest, and that every second
guest can leave, while the hotel quickly regains its fullness.
The root of these paradoxes is that an infinite collection can be put in one-to-one
correspondence with a proper subset (cf. Fig. 1.2, above). If finitism is true, then of
course we can rule all such paradoxes out of court. This provides a simple argument
for finitism: If finitism is not true, then Hilbert’s Hotel is possible. But Hilbert’s Hotel
is absurd and hence not possible, so finitism is true.
But while Hilbert’s Hotel is indubitably strange, the strange and the absurd (or
impossible) are different, as is proved by the strangeness of the platypus. We could just
conclude from Hilbert’s Hotel that infinity is roomier than we previously thought.
One might think that an outright contradiction can be proved from Hilbert’s Hotel.
For instance:
(3) The collection of even-numbered rooms is smaller than the collection of all
rooms.
(4) The two collections can be put in one-to-one correspondence (matching room
n for even values of n with room n/2).
(5) Two collections that can be put in one-to-one correspondence are of the
same size.
(6) If A is smaller than B, then A is not the same size as B.
(7) So the two collections both are and are not the same size.
Assuming that “smaller” and “same size” are used univocally throughout, there are
two ways of rejecting the argument. First, one can reject (3). Granted, for finite sets a
proper subset is smaller than its proper superset. But we shouldn’t expect this to be
true in infinite cases. After all, infinite cases are different from finite ones. Alternately,
one can reject (5) (of course, here, “size” cannot be stipulated as was done in Section 2).
The question of how to gauge what is absurd and what is merely strange is a difficult
one. While I do not see much of a cost to rejecting (3) or (5), others will. Nonetheless,
in the case at hand there is a very strong reason to reject finitism, and thus accept the
possibility of something like Hilbert’s Hotel.
A related paradox is the following. Intuitively, there are more positive integers than
prime numbers. But now imagine an infinite collection of sheets of paper, with one
side red and one side green. It is as clear as anything that the number of red sides
equals the number of green sides. Now suppose that the green sides are numbered9
1, 2, 3, . . . , and suppose that the red side of a piece of paper that has n on its green
side contains an inscription of the nth prime number (we won’t run out of primes:
9 The “ink” will have to be a non-molecular sort, since in order to fit very long numbers on the page, the
there are infinitely many of them10 ). Then the number of red sides equals the number
of primes, and the number of green sides equals the number of positive integers, and
since the number of red sides equals the number of green sides, we conclude that
the number of primes equals the number of positive integers, which contradicts the
assumption that there are more positive integers than primes.
Denying the possibility of an actual infinite kills the paradox. But one can also
solve the paradox by saying that the argument is a reductio ad absurdum of the initial
intuition that there are more positive integers than prime numbers. And denying the
possibility of an actual infinity only kills the paradox at the cost of undercutting this
initial intuition in a different way. For if actual infinites are impossible, then it seems
to make no sense to say that there are more positive integers than prime numbers,
since neither infinite plurality can actually exist. We will now consider an argument
against finitism along a similar line.
4.3 Mathematics: A disadvantage
.. infinitely many primes
A flatfooted mathematics-based argument against finitism is: “There are infinitely
many primes. So finitism is false.” (Note, too, how this argument doesn’t seem to affect
causal finitism, since numbers appear to be causally inert.)
But perhaps when the finitist told us that there couldn’t be an actual infinity of
things, she was thinking about concrete things like rooms and not abstract ones like
numbers?
This is not plausible, however. For while the finitist’s arguments are formulated
in terms of concrete things, the intuitions on size that underwrite arguments like
(3)–(7) apply just as much in the case of abstracta. The fact that there are as many
even numbers as natural numbers is in itself counterintuitive, and the Hotel merely
makes this more vivid. Thus the finitist cannot afford to restrict her view to concrete
entities, since doing so leaves unanswered paradoxes that intuitively are of exactly the
same sort as the ones she resolves.
Furthermore, the distinction between abstract and concrete objects is not a par-
ticularly clear one, and unless it is clarified it is hard to say why exactly one would
think that infinite collections of concrete things are a problem but infinite collections
of abstract things are not.
For instance, one clarification of the notion of concreteness in the literature is given
by Pruss and Rasmussen (2018), who say that an entity is concrete if and only if it
is possible for the entity to cause something. If this is right, then the finitist who
10 The classic proof is a reductio ad absurdum. If there are finitely many primes, let p be the product of
all of them. Then p + 1 is bigger than every prime. Moreover, p + 1 is not divisible by any prime, since
it yields remainder one when divided by any prime. But a number not divisible by any prime is a prime.
So p + 1 is a prime bigger than every prime, which is absurd.
OUP CORRECTED PROOF – FINAL, 14/6/2018, SPi
thinks that there are infinitely many primes would need to answer why it is that
the possession of causal powers rules out infinities. After all, although the rooms in
Hilbert’s Hotel presumably have the possibility of causing things (for instance, a wall
can cause pain in a fist), nothing in the paradox depended on the causal possibilities
for the rooms. One might as well say that Hilbert’s Hotel is impossible because the
rooms possibly have color.
So objecting to the flatfooted argument from primes on the basis of a distinction
between abstracta and concreta is not promising. A better option, however, is to point
out that the argument depends on a Platonist interpretation of the sentence “There are
infinitely many primes.” But Platonism is not the only position in the philosophy of
mathematics. There are other options.
But not all of the other options are available to the finitist. The finitist labors under
the special disability that not only does she think that the infinitude of mathematical
objects does not exist, but she thinks that nothing with the relevant structure—
a central aspect of that structure being infinitude—could possibly exist. Thus the
mathematician is someone studying impossible situations. But while it has always
been a wonder that something as rarefied and abstract as mathematics should be
applicable to the actual world, it is a true miracle that the study of genuinely impossible
things should be of such relevance to us. How could the queen of the natural sciences
be the study of impossible structures?
Consider, too, that mathematics involves proofs from axioms. Certain axioms
are controversial, and hence they are not always assumed. Thus, in some contexts,
mathematicians go out of their way to flag that they did not assume the Axiom
of Choice in a proof. The reason for excluding axioms from the assumptions for a
proof is two-fold. The first reason comes from epistemic concerns about the truth
of the axiom. Since we’re not sure the Axiom of Choice is true, it is safer not to
assume it. The second is theoretical: even if the given axiom were true, we would be
interested in knowing what it would be like if we had a system that did not satisfy
that axiom.
But the finitist takes herself to have established on pain of absurdity that there
cannot be infinitely many things. If that’s really established, then we do not have
an epistemic reason to exclude the Axiom of Finitude—that there are only finitely
many things—from the axioms used in our mathematical work. And if the Axiom of
Finitude is necessarily true, then the question of what it would be like if a system failed
to satisfy the axiom is more of a logician’s or philosopher’s question than a question
for the typical mathematician to wonder about. While some mathematicians do in
fact study alternative collections of axioms for set theory, typical mathematicians are
happy to assume axioms of set theory they find intuitive. Likewise, if the Axiom of
Finitude were necessarily true, then most working mathematicians should assume it
and study its consequences, rather than engaging in the study of the per impossibile
counterfactual of what would happen if there were infinities. The resulting mathemat-
ical practice would be very different from ours, and we have good reason to doubt the
Another random document with
no related content on Scribd:
The Project Gutenberg eBook of Lauluja
This ebook is for the use of anyone anywhere in the United States
and most other parts of the world at no cost and with almost no
restrictions whatsoever. You may copy it, give it away or re-use it
under the terms of the Project Gutenberg License included with this
ebook or online at www.gutenberg.org. If you are not located in the
United States, you will have to check the laws of the country where
you are located before using this eBook.
Title: Lauluja
Language: Finnish
Kirj.
Antti Rytkönen
SISÄLLYS:
Syvänteet.
Kuohuissa.
Meri ja taivas.
Takatalvessa.
Kesää odottaissa.
Hän..
Sinä ja minä.
Lehdossa.
Sorsa se Saimaan aalloissa sousi.
Valkojoutseneni.
Valkamani.
Lauluni.
Se lempi.
Eloni.
Levoton.
Kevättuulessa.
Kaipuuni.
Kuusen alla.
Talvilehto.
Valtameri.
Laulu talvelle.
Oli metsä vihreä.
Merelle lähtijä.
Luojalle.
Rauhassa.
Rannan kuusi.
Myrsky-yönä.
Merenneitojen laulu.
Meriltä palatessa.
Kevät-iltana.
Tähtöselleni.
Samponi.
Syystunnelma.
Keväinen koski.
Muistojen mailta.
Tyhjä sija.
Sairas soittaja.
Niin syvästi särki se äidin mieltä.
Turhaan.
Manan morsian.
Mari pikkunen piika.
Paimeritytön kevätlaulu.
Tuliluulialei.
Ikävissä.
Paimenpoika ja paimentyttö.
Paimenpojan laulu.
Koti lahteen soutaessa.
Mistä kyynel.
Leppäkerttu ja tuomenterttu.
Musta lintu, merikotka..
Järven jäällä.
Köyhän koti.
Heilini.
Kevätkylmissä.
Jäiden lähtö.
Kalevaisten karkelo.
Kevätmietteissä.
Ainon kaiho.
Kerran lemmin.
12-13.IV.1597.
Korven keskellä.
Kylänkarkelo.
Tarina Pekasta ja vallesmannista.
Pimeän pesä.
Voiton saatte.
Maamiehen kevätlaulu.
Tahdon ikitulta.
Syvänteet.
Syvänteihin katseleisin, mi lie siellä elo kumma?
Salaisuudetpa ne syvät kätkee multa meri tumma.
Kuohuissa.
Meri ja taivas.
Takatalvessa.
Kesää odottaissa.
Sinä ja minä.
Lehdossa.
Valkojoutseneni.
Mun valkojoutseneni,
sä miksi lensit pois?
Valkamani.
Kun meri ärjyy, aaltoo ja tummana vaahtoaa, kun pilvinen
on taivas ja rinta ei rauhaa saa,
Lauluni.
Se lempi.
Eloni.
Haaksi aaltojen ajama, vene vetten vierittämä on mun
vaivaisen vaellus.
Levoton.
Kevättuulessa.
Kuusen alla.
Talvilehto.
Valtameri.
Rintani on valtameri,
miksi rauhaa etsit sieltä,
miksi tyyntä, sointuisuutta
ulapan ja aallon tieltä?
Laulu talvelle.
Ja kuitenkin, ja kuitenkin
ne tuli ne keväiset kylmätkin.
Merelle lähtijä.
Rauhassa.
Rannan kuusi.
Myrsky-yönä.
***
Merenneitojen laulu.
Kevät-iltana.