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Single Idea 11070

[filed under theme 2. Reason / F. Fallacies / 1. Fallacy ]

Full Idea

The fallacy of 'denying the antecedent' is of the form φ→ψ, ¬φ, so ¬ψ.

Gist of Idea

'Denying the antecedent' fallacy: φ→ψ, ¬φ, so ¬ψ

Source

Robert Hanna (Rationality and Logic [2006], 5.4)

Book Ref

Hanna,Robert: 'Rationality and Logic' [MIT 2006], p.141

The 8 ideas with the same theme [distinctive types of recurrent error in human reasoning]:

19463 Induction assumes some uniformity in nature, or that in some respects the future is like the past [Ayer]
21697 The Struthionic Fallacy is that of burying one's head in the sand [Quine]
12223 It is a fallacy to explain the obscure with the even more obscure [Hale/Wright]
14603 'Reification' occurs if we mistake a concept for a thing [Schaffer,J]
11070 'Denying the antecedent' fallacy: φ→ψ, ¬φ, so ¬ψ [Hanna]
11071 'Affirming the consequent' fallacy: φ→ψ, ψ, so φ [Hanna]
11088 We can list at least fourteen informal fallacies [Hanna]
4686 Fallacies are errors in reasoning, 'formal' if a clear rule is breached, and 'informal' if more general [PG]