What is a counterpostive?

Answer 1

A contrapositive is a logical statement derived from a conditional statement by negating both the hypothesis and the conclusion and then reversing them. For example, the contrapositive of "If P, then Q" is "If not Q, then not P." A contrapositive is logically equivalent to the original statement, meaning if the original statement is true, the contrapositive is also true. This concept is often used in mathematical proofs and logical reasoning.