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denying the consequent

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affirming the antecedent

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

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

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 antecedent

denying the antecedent  

In conditional reasoning, arguing invalidly from a hypothetical proposition of the form If p then q that, because p is false, therefore q is false. For example, given the proposition If the burglars ...
denying the consequent

denying the consequent   Reference library

Colwyn Williamson

The Oxford Companion to Philosophy (2 ed.)

Reference type:
Subject Reference
Current Version:
2005
Subject:
Philosophy
Length:
103 words

In a hypothetical proposition ‘If p, then q’, p is the antecedent, q the consequent. Asserting that q is false, so that the falsity of ...

modus tollens

modus tollens  

Any argument taking the form: If p, then q; Not-q; Therefore not-p. For example, If it is Sunday, then the restaurant is closed; The restaurant is not closed; Therefore, it is not Sunday. Such an ...

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