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affirming the antecedent
In conditional reasoning, arguing validly from a hypothetical proposition of the form If p then q that, because p therefore q. For example, given the proposition If the burglars entered by the front ...
affirming the consequent
In conditional reasoning, arguing invalidly from a hypothetical proposition of the form If p then q that, because q therefore p. For example, given the proposition If the burglars entered by the ...
conditional reasoning
A form of logical reasoning based on conditional statements or conditional propositions having the form If p, then q, in which p is the antecedent and q is the consequent. An example is If this ...
denying the consequent
In conditional reasoning, arguing validly from a hypothetical proposition of the form If p then q that, because q is false, therefore p is false. For example, given the proposition If the burglars ...
denying the antecedent Reference library
Colwyn Williamson
The Oxford Companion to Philosophy (2 ed.)
To reason that, because Nazis hate Jews and John is not a Nazi, he cannot be an anti-Semite, is to commit this fallacy. In the traditional logic of terms, inferences like ‘If ...
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