Yes, because a variable cannot be both true and not true.
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If P is a positive integer, then let 2n be the largest power of two that divides P. Then P = Q2n, where Q is the quotient of this division. Clearly Q is odd - for otherwise, 2 would divide Q, which would mean 2n + 1 also divides P, a contradiction.
The sum of p and q means (p+q). The difference of p and q means (p-q).
1)p->q 2)not p or q 3)p 4)not p and p or q 5)contrudiction or q 6)q
p*q
if the statement is : if p then q converse: if q then p inverse: if not p then not q contrapositive: if not q then not