Paradox
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An axiom.
compound
irony
by switching the truth values of the hypothesis and conclusion, it is called the contrapositive of the original statement. The contrapositive of a true conditional statement will also be true, while the contrapositive of a false conditional statement will also be false.
This question is unanswerable. How can a "statement of truth" be made which "is not true". Truth does not change. It cannot be that something was true when it was said and later it became untrue.