2 Answered Questions for the topic Deductive

Deductive Philosophy Logic Phil


1) ?P(c = b?P(c)) 2) ?x( f (b) = x)) (note: ? means backwards E)

Suppose we have an FOL with names/constants a,b,c,d, variables x,y, z, function symbolsf (x),g(x),h(x,y), predicate symbols P(x),Q(x),R(x,y),x = y, the usual connectives and the quantifiers∀,∃. For... more


if R is a tautological consequence of P1, . . . ,Pn,P and also a tautological consequence of P1, . . . ,Pn,Q,

  then R is a tautological consequence of P1, . . . ,Pn,P∨Q. Explain this please..i don't understand       How could you use the result established above to give a careful justification for... more

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