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Reasoning about the Elementary Functions of Complex Analysis

Published: 17 July 2000 Publication History

Abstract

There are many problems with the simplification of elementary functions, particularly over the complex plane. Systems tend to make major errors, or not to simplify enough. In this paper we outline the "unwinding number" approach to such problems, and show how it can be used to prevent errors and to systematise such simplification, even though we have not yet reduced the simplification process to a complete algorithm. The unsolved problems are probably more amenable to the techniques of artificial intelligence and theorem proving than the original problem of complex-variable analysis.

References

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Abramowitz, M. & Stegun, I., Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. US Government Printing Office, 1964. 10th Printing December 1972.
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Bradford, R.J., Algebraic Simplification of Multiple-Valued Functions. Proc. DISCO '92 (Springer Lecture Notes in Computer Science 721, ed. J.P. Fitch), Springer, 1993, pp. 13-21.
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CarathÉodory,C., Theory of functions of a complex variable (trans. F. Steinhardt), 2nd. ed., Chelsea Publ., New York, 1958.
[4]
Corless, R.M., Davenport, J.H., Jeffrey, D.J. & Watt, S.M., "According to Abramowitz and Stegun". To appear in SIGSAM Bulletin. OpenMath Project (Esprit 24969) deliverable 1.4.6.
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Corless, R.M. & Jeffrey, D.J., The Unwinding Number. SIGSAM Bulletin 30 (1996) 2, pp. 28-35.
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Davenport, J.H. & Fischer, H.-C., Manipulation of Expressions. Improving Floating-Point Programming (ed. P.J.L. Wallis), Wiley, 1990, pp. 149-167.
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Encyclopedia Britannica, 15th. edition. Encyclopedia Britannica Inc., Chicago etc., 15th ed., 1995 printing.
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IEEE Standard Pascal Computer Programming Language. IEEE Inc., 1983.
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IEEE Standard 754 for Binary Floating-Point Arithmetic. IEEE Inc., 1985.
[10]
Kahan, W., Branch Cuts for Complex Elementary Functions. The State of Art in Numerical Analysis (ed. A. Iserles & M.J.D. Powell), Clarendon Press, Oxford, 1987, pp. 165-211.
[11]
Litt, G., Unwinding numbers for the Logarithmic, Inverse Trigonometric and Inverse Hyperbolic Functions. M.Sc. project, Department of Applied Mathematics, University of Western Ontario, December 1999.
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Cited By

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  • (2004)Not seeing the roots for the branchesACM SIGSAM Bulletin10.1145/1040034.104003638:3(57-66)Online publication date: 1-Sep-2004
  • (2004)Understanding expression simplificationProceedings of the 2004 international symposium on Symbolic and algebraic computation10.1145/1005285.1005298(72-79)Online publication date: 4-Jul-2004
  • (2002)Towards better simplification of elementary functionsProceedings of the 2002 international symposium on Symbolic and algebraic computation10.1145/780506.780509(16-22)Online publication date: 10-Jul-2002

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Published In

cover image Guide Proceedings
AISC '00: Revised Papers from the International Conference on Artificial Intelligence and Symbolic Computation
July 2000
252 pages
ISBN:3540420711

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Springer-Verlag

Berlin, Heidelberg

Publication History

Published: 17 July 2000

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Cited By

View all
  • (2004)Not seeing the roots for the branchesACM SIGSAM Bulletin10.1145/1040034.104003638:3(57-66)Online publication date: 1-Sep-2004
  • (2004)Understanding expression simplificationProceedings of the 2004 international symposium on Symbolic and algebraic computation10.1145/1005285.1005298(72-79)Online publication date: 4-Jul-2004
  • (2002)Towards better simplification of elementary functionsProceedings of the 2002 international symposium on Symbolic and algebraic computation10.1145/780506.780509(16-22)Online publication date: 10-Jul-2002

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