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Rules of Inference (Part II: Modus Ponens)

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Many first-year logic students have heard of the "rules of inference"; in fact, many students may have even heard of a few. A good place to start for covering those rules is Modus Ponens. However, what does this phrase mean? What rule does it denote? Here is a concise overview of the most well-known inference rule.

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Our first rule of inference to cover is Modus Ponens. The phrase "modus ponens" means "asserting mode."

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Our first rule of inference to cover is Modus Ponens. The phrase "modus ponens" means "asserting mode." In this translation, you might already be able to tell how the rule operates: namely, it relies on an assertion.

However, to make this assertion, the form Modus Ponens (or, "MP") first must establish the opportunity to use that assertion effectively. It establishes this opportunity ...

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