A set of four problems and answers for the first four Rules of Implication (Disjunctive Syllogism, Hypothetical Syllogism, Modus Ponens, and Modus Tollens)

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An explication of the Rule of Implication known as Modus Ponens in Propositional Logic (90 Second Philosophy and 100 Days of Logic).

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An explanation of how Rene Descartes’s claim “I think therefore I am” can be broken into just two statements: I think and I exist.

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