Wednesday, October 12, 2011

Logical Fallacy of the Week, Week 12: Fallacy of exclusive premises


The fallacy of exclusive premises is a syllogistic fallacy committed in a categorical syllogism that is invalid because both of its premises are negative.

Example of an EOO-4 invalid proposition:

E Proposition: No mammals are fishes.
O Proposition: Some fishes are not whales.
O Proposition: Therefore, some whales are not mammals.

Please follow the link for additional information and links.  RK


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