Titlebook: Automation of Reasoning; 2: Classical Papers Jörg H. Siekmann,Graham Wrightson Book 1983 Springer-Verlag Berlin Heidelberg 1983 Automation

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On Simplifying the Matrix of a WFFcate calculus in closed prenex normal form with prefixes of the form ∀x..∀x.∃y..∃Ym∀z..∀.. . Given such a wff .,where . is the prefix and M is the matrix in conjunctive normal form, Friedman’s rules can be used, in effect, to construct a matrix . which is obtained from . by deleting certain conjunct

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