Modus tollens is an admissible rule of intuitionistic logic : it's the converse, if ~ q?! ~ p then p?! q which the intuitionists reject ( and adding this rule to intuitiontistic logic gives classical logic ).They accept the possibility of motion and apply modus tollens ( contrapositive ) to Zeno's argument to reach the conclusion that either motion is not a supertask or not all supertasks are impossible.The argument is in the form of a modus tollens : If P then Q but Q is implausible ( or " queer " ), so P is implausible.The argument is structured as a basic modus tollens : if " creation " contains many defects, then design is not a plausible theory for the origin of our existence.It's difficult to see modus tollens in a sentence.The inference rule " modus tollens " validates the inference from P implies Q and the contradictory of Q to the contradictory of P.This is often called the " law of contrapositive ", or the " modus tollens " rule of inference.Popular rules of inference in propositional logic include " modus ponens ", " modus tollens ", and contraposition.In instances of " modus tollens " we assume as premises that p ?! q is true and q is false.Modus ponens is closely related to another valid form of argument, " modus tollens ".The first to explicitly describe the argument form " modus tollens " were the Stoics.So then modus tollens wouldn't be included as an inference rule in constructive logics?.The history of the inference rule " modus tollens " goes back to antiquity.The falsification of statements occurs through " modus tollens ", via some observation.It is very closely related to the rule of inference modus tollens.
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