Solved: Show that each of these statements can be used to
Chapter 1, Problem 1.7.13(choose chapter or problem)
Show that each of these statements can be used to express the fact that there is a unique element x such that P(x) is true. [Note that we can also write this statement as 3!xP(x).] a) 3xVy(P(y) ++ x = y) b) 3xP(x) /\ VxVy(P(x) /\ P(y) -+ X = y) c) 3x(P(x) /\ Vy(P(y) -+ x = y
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