Kleene's theorem

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1 on regular expressions. A theorem in formal language theory proposed by Stephen Kleene and stating that a language is definable by a regular expression if and only if it is recognized by a finite-state automaton. A regular expression equivalent to a finite-state automaton can be found by solving a set of simultaneous linear equations (see linear grammar, Arden's rule). Regular expressions were first used to characterize the power of certain neural networks.

2 on fixed points. See fixed-point theorem.

Subjects: Computing.

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