A description of the four versions of the Change of Quantifier Rule in Predicate Calculus (100 Days of Logic).

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An explication of the fifth rule for validity of categorical syllogisms dealing with the difference between conditionally valid and unconditionally valid syllogisms (90 Second Philosophy & 100 Days of Logic).

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A description of Rule IV for validity for categorical syllogisms that negative conclusions must be drawn from negative premises and negative premises must illicit negative conclusions.(90 Second Philosophy & 100 Days of Logic)

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An explanation of the logical fallacy known as exclusive premises, in which a categorical syllogism breaks the third rule of validity and has two negative premises (Fallacy February & 100 Days of Logic).

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An explanation of the third rule of validity for categorical syllogisms, that at least one premise must be affirmative (90 Second Philosophy & 100 Days of Logic).

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A description of the second rule of validity for categorical syllogisms that the terms that are distributed in the conclusion must be distributed in the premises (90 Second Philosophy & 100 Days of Logic)

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An explanation of the first rule of validity for categorical, that the middle term must be distributed (90 Second Philosophy & 100 Days of Logic)

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A description of the fallacy of Hasty Generalization also known as the opposite of the Fallacy of Accident (90 Second Philosophy & Fallacy February).

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The answers to the second round of Problems for the Rules of Replacement. These can be solved using the 18 Rules of Inference (90 Second Philosophy & 100 Days of Logic).

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An explanation of the Rule of Replacement that goes by the name of Tautology in Propositional Logic.

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