The 5th video in Dr. Richard Brown’s Online Introduction to Philosophy. For all videos see http://onlinephilosophyclass.wordpress.com/philosophy-101/

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The 5th video in Dr. Richard Brown’s Online Introduction to Philosophy. For all videos see http://onlinephilosophyclass.wordpress.com/philosophy-101/

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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 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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An Explanation of the Aristotelian style of Venn Diagrams and how to tell if a categorical syllogism is valid for Aristotle (100 Days of Logic & 90 Second Philosophy).

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An explication of how to create a Venn diagram for categorical syllogisms in more complicated case where the “X” ends up on a line (90 Second Philosophy & 100 Days of Logic).

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An explication of the third figure of categorical syllogisms (90 Second Philosophy and 100 Days of Logic).

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