Affirming a disjunct
Formal fallacy / From Wikipedia, the free encyclopedia
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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:[1]
- A or B
- A
- Therefore, not B
Or in logical operators:
- ¬
Where denotes a logical assertion.