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Denying the antecedent

Denying the antecedent, sometimes also called inverse error or fallacy of the inverse, is a formal fallacy of inferring the inverse from an original statement. It is a type of mixed hypothetical syllogism in the form:If P, then Q. Not P. Therefore, not Q.
wikipedia:: Denying the antecedent

sometimes also called inverse error or fallacy of the inverse

Fallacy

P > Q
~P
Thus, not Q

Valid conclusion: ~P v Q

Denying the antecedent
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Denying the antecedent
Fallacy