Modus tollens  

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Kunstformen der Natur (1904) by Ernst Haeckel
Kunstformen der Natur (1904) by Ernst Haeckel

In classical logic, modus tollens (or modus tollendo tollens) (Latin for "the way that denies by denying") has the following argument form:

If P, then Q.
Not Q.
Therefore, not P.

See also

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