A Computational Logic by Robert S. Boyer

By Robert S. Boyer

In contrast to such a lot texts on common sense and arithmetic, this publication is set the best way to end up theorems instead of evidence of particular effects. We supply our solutions to such questions as: - while should still induction be used? - How does one invent a suitable induction argument? - while may still a definition be extended?

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D. Before proving that the domain of FO is Dn we adopt the notational convention that body ' is an abbreviation for the result of substituting Yi for Xi in body[F0 * ] . For example, if body is the term ( I F ( LISTP XI) (FNX1X2) F) , then body» is ( I F (LISTP Yl) (FO' Yl Y2) F) . n P R O O F T H A T T H E D O M A I N O F FO Is D . Suppose that FO is not de­ n fined on every element of D . Let ( Y l , . . , Yn) be an RM-minimal element of Dn not in the domain of FO . Let FO ' be the extension of FO .

Furthermore, no one has yet proved that all algorithms require exponential time in the worst case. The version of TAUTOLOGY. CHECKER that we present is more effi­ cient than the truth table method on one important class of express­ ions, namely, those in " I F - n o r m a l form. ,, u An expression x is said to be in IF-normal form provided that no subterm of x beginning with an I F has as its first argument another term beginning with an I F . Of the three example formulas above, the first two are in I F - n o r m a l form and the last is not.

But ( FO XI . . Xn) = (GX1 . . Xn) = b o d y [ G ' ] = b o d y [ F 0 ' ] . D. Before proving that the domain of FO is Dn we adopt the notational convention that body ' is an abbreviation for the result of substituting Yi for Xi in body[F0 * ] . For example, if body is the term ( I F ( LISTP XI) (FNX1X2) F) , then body» is ( I F (LISTP Yl) (FO' Yl Y2) F) . n P R O O F T H A T T H E D O M A I N O F FO Is D . Suppose that FO is not de­ n fined on every element of D . Let ( Y l , . . , Yn) be an RM-minimal element of Dn not in the domain of FO .

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