Denier

Definition and stakes

Portrait of Augustus De Morgan Augustus De Morgan,  A Budget of Paradoxes, Volume I

“ Logicians are beginning to see that the notion of horse is inseparably connected with that of non-horse: that the first without the second would be no notion at all. And it is clear that the positive affirmation of that which contradicts mathematical demonstration cannot but be accompanied by a declaration, mostly overtly made, that demonstration is false. If the mathematician were interested in punishing this indiscretion, he could make his denier ridiculous by inventing asserted results which would completely take him in. ”
Source: Gutenberg

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