Hypothetical syllogism

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What Wikipedia says

In classical logic, a hypothetical syllogism is a valid argument form, a deductive syllogism with a conditional statement for one or both of its premises. Ancient references point to the works of Theophrastus and Eudemus for the first investigation of this kind of syllogism.

Excerpt from the Wikipedia article “Hypothetical syllogism”, under the CC BY-SA 4.0 license. Read the article on Wikipedia