Proof by tenure

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Proof by tenure is a derogatory description for a flawed mathematical proof presented in class by a professor. The term does not apply to simple mistakes such as poor arithmetic, but instead tends to refer to a proof in which the professor makes a more fundamental mistake, e.g. relying on a logical fallacy. If the proof is questioned during or after class, the professor may not immediately acknowledge the flaw.

The term "proof by tenure" is somewhat of a misnomer because the professor in question may not in fact be tenured, however, the term is still applicable.