June 2001
Intermediate to advanced
2128 pages
82h 43m
English
Content preview from Handbook of Automated Reasoning
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5.2 The class of commutative/monoidal theories
In order to generalize this semantic approach to a whole class of theories, let us try to determine the relevant common features of the theories ACU, ACUI, and AG. Using a rather syntactic point of view, we may observe that all three theories are concerned with an associative-commutative binary function symbol f with a unit e. In addition, the signature of AG contains a unary function symbol i, which behaves like an endomorphism for f and e, i.e., i(f(x,y)) = AG f(i(x),i(y)) and i(e) = AG e. This observation motivates the following definition of monoidal theories [Nutt 1990]:
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