Publisher's Synopsis
Excerpt from Decision Procedures for Elementary Sublanguages of Set Theory; Vi; Multi-Level Syllogistic Extended by the Powerset Operator
Definition A place a of P is a O/l-valued function defined on the set of all variables in P such that c(x) a(y) V a(z) (resp. C(x) a(y) g429) if x y U z (resp. X y z), belongs to P, and such that c(x) E 0 if x G appears in P. Given a variable x, the place a is said tosbe: a place of P at x if a(y) (resp. A(y) 0) whenever x e y (resp. X d y) appears in P.
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