Answer to Question #7544 in Prolog for jerrycvem

Question #7544
The objective of this project is to build a Prolog program that can transform Well-formed formulas (fbf) of a first order logical language to normal form (conjunctive cnf or normal form). To properly handle the existential variables we introduce a new rewrite rules, Skolemizzazione said: exist(X, p(X)) -> p(sk00042) Note how sk00042 'and a constant and not variable. Note also that this operation 'and realt'a pi'u complicated in the presence of variables universally quantified. every(Y, exist(X, p(X, Y))) -> every(Y, p(sf666(Y), Y)) A variable existential can be replaced by a function (called Skolem) which is applied variables pi'u universal "external". You'll need the following code to manage the operation of Skolemization: skolem_variable(V, SK) :- var(V), gensym(skv, SK). skolem_function([], SF) :- skolem_var(_, SF). skolem_function([A | ARGS], SF) :- gensym(skf, SF_op), SF =.. [SF_op, A | ARGS].
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