Argument to Logic, Argumentum ad Logicam, fallacy fallacy
Deductive Logic Arguments, Formal Logic
States that if an argument for some conclusion is fallacious, then the conclusion is also fallacious.
Tom: "OK - I'll prove I'm English - I speak English so that proves it". Bill: "But Americans and Canadians, among others, speak English too. You have committed the package deal fallacy, assuming that speaking English and being English always go together. That meas you are not English".
Argument form: If P, then Q P is a fallacious argument. Therefore, Q is false.
Point out that when an argument is fallacious it only means that the argument cannot succeed in proving the conclusion.