In philosophy there is also the saying: The modus ponens of one side is the modus tollens of the other side. Meaning that when one side in philosophy says: fr

In philosophy there is also the saying: The modus ponens of one side is the modus tollens of the other side. Meaning that when one side in philosophy says: from A (their body of arguments) follows B, and A holds, thus B must hold. A&B, A => B is called modus ponens. Then the other side will say: from A follows B, and B does clearly not hold, thus A does not (or cannot) hold. A&B, ~B => ~A is called modus tollens. Just wanted to add this here because that's how in my experience the discussion of such topics close to one's self tend to unfold.