Misproof

Only a misproof of Nöebling [66] (for any m) ensued in the 1930's.

Source: wiktionary

This is what applied mathematics should be about; not the fallacious misproofs of Stoke's theorem or the relentless linearisation of the nonlinear that put me off applied mathematics for 15 years.

Source: wiktionary

The three basic theorems of three-manifold topology -- Dehn's Lemma, the Loop Theorem, and the Sphere Theorem -- were proved in 1957 by Papakyriakopoulos. (Dehn stated his result in 1910, but gave a misproof.)

Source: wiktionary

Misproof occurs when some other than the proposition stated is proved. This may occur from confusion, or may be intentional, as in attacking the character of an opponent (argumentum ad hominem); appealing to the prejudice (ad populum); or to authority without evidence of validity (ad verecundiam).

Source: wiktionary