* Added annihilation axioms ("x * 0 = 0") to axclass semiring_0.
Richer structures do not inherit from semiring_0 anymore, because
anihilation is a theorem there, not an axiom.
* Generalized axclass "recpower" to arbitrary monoid, not just
commutative semirings.
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<h3>IOA: A basic formalization of I/O automata in HOL</h3>
Author:     Konrad Slind, Tobias Nipkow and Olaf Müller<br>
Copyright   1995,1996 Technische Universität München
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This directory contains a formalization of the meta theory of I/O automata in HOL.
This formalization has been significantly changed and extended.  The new version
is available in the subdirectory HOLCF/IOA.  There are also the proofs of two
communication protocols which formerly have been here.
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