GNU Webster's 1913
- n. (called also
reductio ad absurdum), in which the correct conclusion is an inference from the demonstration that any other hypothesis must be incorrect.
- adj. a mode of demonstration in which proof is given by showing that any other supposition involves an absurdity (
reductio ad absurdum), or an impossibility; thus, one quantity may be proved equal to another by showing that it can be neither greater nor less.
“He believed in "implicit" logic, varied and converging proofs, indirect demonstration (ex impossibili or ex absurdo); assent, in short, in not a mechanical echo of the syllogism but a vital act, distinct and determined.”
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