Question

reduction ad absurdum

Accepted Answer

a mode of argumentation that seeks to establish a contention by deriving an absurdity from its denial, thus arguing that a thesis must be accepted because its rejection would be untenable.

Fallacy	reduction ad absurdum
Definition and Examples	a mode of argumentation that seeks to establish a contention by deriving an absurdity from its denial, thus arguing that a thesis must be accepted because its rejection would be untenable.

Reduction Ad Absurdum Mode Argumentation Seeks Establish Contention