Re: [math-fun] true self-referential sentences with false contrapositives

"If 3 is a prime, then the contrapositive of this sentence is false." The contrapositive is: "If the contrapositive of this sentence is true, then 3 is not prime." which is false. (The contrapositive of the contrapositive is the original statement, which is true.) Sincerely, Adam P. Goucher