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Here is a quoted selection from Garth Kemerling. The links are to
his page.
Commonly occurring formal fallacies include:
-
four terms (quaeternio
terminorum),
undistributed middle,
illicit major,
illicit minor,
exclusive premises,
affirmative conclusion from
negative premises,
existential,
affirming the consequent,
denying the antecedent,
converting the conditional,
negating the antecedent and the
consequent, and
affirming the alternative.
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