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Affirming a disjunct
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Affirming a disjunct : ウィキペディア英語版
Affirming a disjunct

The formal fallacy of affirming a disjunct also known as the fallacy of the alternative disjunct or a false exclusionary disjunct occurs when a deductive argument takes the following logical form:
:A or B
:A
:Therefore, not B
Or in logical operators:
: p \vee q
: p
: \vdash {} denotes a logical assertion.
==Explanation==

The fallacy lies in concluding that one disjunct must be false because the other disjunct is true; in fact they may both be true because "or" is defined inclusively rather than exclusively. It is a fallacy of equivocation between the operations OR and XOR.
Affirming the disjunct should not be confused with the valid argument known as the disjunctive syllogism.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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