A description of the Logical Fallacy of Affirmative from Negative and Negative from Affirmative in Categorical Logic, which breaks the fourth rule of validity (90 Second Philosophy & Fallacy February).

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An explanation of the “O Proposition” in Categorical Logic known as the Particular Negative (90 Second Philosophy & 100 Days of Logic).

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A descriptions of some important vocabulary word in categorical logic (100 Days of Logic & 90 Second Philosophy).

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