Abstract
We find all locally convex homogeneous topologies on (ℝ, ≤ ) and determine which of these have locally convex complements. Among the locally convex topologies on an n-point totally ordered set, each has a locally convex complement and, for n ≥ 3, at least n − 2 of them have 2n − 1 locally convex complements. For any infinite cardinal κ, totally ordered spaces of cardinality κ which have exactly 1, exactly κ, and exactly 2κ locally convex complements are exhibited.
Similar content being viewed by others
References
Alas, O.T., Wilson, R.G.: Which topologies can have immediate successors in the lattice of T 1-topologies? Appl. Gen. Topol. 5(2), 231–242 (2004)
Anderson, B.A.: A class of topologies with T 1-complements. Fund. Math. 69, 267–277 (1970)
Anderson, B.A.: Families of mutually complementary topologies. Proc. Amer. Math. Soc. 29(2), 362–368 (1971)
Anderson, B.A., Stewart, D.G.: T 1-complements of T 1 topologies. Proc. Amer. Math. Soc. 23(1), 77–81 (1969)
Brown, J.I., Watson, S.: The number of complements of a topology on n points is at least 2n (except for some special cases). Discrete Math. 154, 27–39 (1996)
Hartmanis, J.: On the lattice of topologies. Canad. J. Math. 10, 547–553 (1958)
Knight, R.W., Gartside, P., McIntyre, D.W.: All finite distributive lattices occur as intervals between Hausdorff topologies. Order 14, 259–265 (1997–1998)
Lamper, M.: Complements in the lattice of all topologies of topological groups. Arch Math. (Brno) 10(4), 221–230 (1974, 1975)
Lihová, J.: On the lattice of convexly compatible topologies on a partially ordered set. Colloq. Math. Soc. János Bolya 33, 609–625 (1983)
Schnare, P.S.: Multiple complementation in the lattice of topologies. Fund. Math. 62, 53–59 (1968)
Schnare, P.S.: The topological complementation theorem a la Zorn. Proc. Amer. Math. Soc. 35(1), 285–286 (1972)
Shakhmatov, D., Tkachenko, M.: A compact Hausdorff topology that is a T 1-complement of itself. Fund. Math. 175(2), 163–173 (2002)
Steiner, A.K.: The lattice of topologies: structure and complementation. Trans. Amer. Math. Soc. 122, 379–398 (1966)
Steiner, A.K.: Complementation in the lattice of T 1-topologies. Proc. Amer. Math. Soc. 17, 884–886 (1966)
Steiner, A.K., Steiner, E.F.: Topologies with T 1-complements. Fund. Math. 61, 23–28 (1967)
Steiner, A.K., Steiner, E.F.: A T 1-complement for the reals. Proc. Amer. Math. Soc. 19, 177–179 (1968)
Van Rooij, A.C.M.: The lattice of all topologies is complemented. Canad. J. Math. 20, 805–807 (1968)
Watson, S.: The number of complements in the lattice of topologies on a fixed set. Topology Appl. 55(2), 101–125 (1994)
Uzcátegui, C.: Maximal complements in the lattice of pre-orders and topologies. Topology Appl. 132(2), 147–157 (2003)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Richmond, T.A. Complementation in the Lattice of Locally Convex Topologies. Order 30, 487–496 (2013). https://doi.org/10.1007/s11083-012-9257-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11083-012-9257-1