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The term non sequitur literally means "it does not follow". In this section we describe fallacies which occur as a consequence of invalid arguments.-

Any argument of the following form is invalid: (1) If A then B (2) B Therefore, A

Any argument of the following form is invalid: (1) If A then B (2) Not A (3) Therefore, Not B

The author asserts more than one proposition such that the propositions cannot all be true. In such a case, the propositions may be contradictories or they may be contraries.