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*Therefore P is false
*Therefore P is false
For example: "We all know that George beats his wife, so obviously he's wrong when he says that we should vote against this proposition." This is fallacious reasoning because the premise ("George beats his wife") does not have a logical link with the conclusion ("George is wrong"). Whatever undesirable qualities a person may have, they do not affect the truth or falsity of what he says.
For example:
* Hitler and his top aides argued that the theory of ballistics could be used to bomb London
* Hitler and his top aides were evil
* Therefore, the theory of ballistics is likely wrong
====''Ad hominem tu quoque''====
====''Ad hominem tu quoque''====
As an example, [[Gregor Mendel]] established the genetic theory that remains current today, even though Mendel's experimental technique was badly flawed, and he even stands accused of falsifying key data. But succeeding [[science|scientists]], using accepted methods of verification and statistical assessment, have achieved results consistent with this theory. Thus the theory remains valid even though Mendel's original presentation was fraudulent. Any attempt today to discredit Mendel's theory on account of Mendel's sloppy methods would be an example of a genetic fallacy.<ref name=Genetic>[http://www.fallacyfiles.org/genefall.html Genetic Fallacy] on [http://www.fallacyfiles.org/ The Fallacy Files]</ref>
As an example, [[Gregor Mendel]] established the genetic theory that remains current today, even though Mendel's experimental technique was badly flawed, and he even stands accused of falsifying key data. But succeeding [[science|scientists]], using accepted methods of verification and statistical assessment, have achieved results consistent with this theory. Thus the theory remains valid even though Mendel's original presentation was fraudulent. Any attempt today to discredit Mendel's theory on account of Mendel's sloppy methods would be an example of a genetic fallacy.<ref name=Genetic>[http://www.fallacyfiles.org/genefall.html Genetic Fallacy] on [http://www.fallacyfiles.org/ The Fallacy Files]</ref>
===Proof by numbers===
===Proof by numbers===