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Free groups and regular expressions

Published: 05 May 1969 Publication History

Abstract

Group events are defined as regular events recognized by partial group automata. Canonical forms are introduced for the class of regular expressions denoting group events. Algorithms are presented to find a canonical form from a recognizing automaton, to find a recognizing automaton from a canonical form, and to find a canonical form from a regular expression denoting a simple group event. Furthermore an algorithm is presented that decides whether or not two canonical forms denote the same event.

References

[1]
J. A. Brzozowski: "Roots of Star Events," Journal of the Association of Computing Machinery, Vol. 14, No. 3, July, 1967, pp. 466-477.
[2]
S. Ginsburg: An Introduction to Mathematical Machine Theory. Addison-Wesley, 1962.
[3]
M. Hall: The Theory of Groups, The MacMillan Company, 1961.
[4]
M. A. Harrison: Introduction to Switching and Automata Theory, McGraw Hill, 1965.
[5]
S. C. Kleene: Representation of Events in Nerve Nets and Finite Automata, Automata Series, Princeton University Press, 1956.
[6]
J. Nielsen: "Om regning med ikke-kom-mutative faktorer og dens anvendelse i gruppeteorien," Matematisk Tidsskrift B (1921), pp. 77-94.
[7]
O. Schreir: "Die Untergruppen der freien Gruppen," Abh. aus dem Math. Seminar der Hamburgischen Unlversität 5, pp. 161-183.
[8]
J. Hartmanis and R. E. Stearns: Algebraic Structure Theory of Sequential Machines, Prentice Hall, 1966.
[9]
K. K. Krohn and J. L. Rhodes: "Algebraic Theory of Machines," Proc. of Symposium on Mathematical Theory of Automata, Polytechnic Press, 1963.

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cover image ACM Conferences
STOC '69: Proceedings of the first annual ACM symposium on Theory of computing
May 1969
267 pages
ISBN:9781450374781
DOI:10.1145/800169
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Association for Computing Machinery

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Published: 05 May 1969

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