Zhao Xiaoming Children's Logic

Author: Zhao Xiaoming Editor and Typesetter: Cui Guanli

There is such a joke. Once upon a time, an official escorted a criminal monk home with a package, an umbrella and some documents. This official is a bit silly, always afraid that he forgot to bring something, so he made a sentence after counting things: bag, umbrella, cangue, document, monk, me.

The director read this sentence while walking. The monk found that the chief was a little silly, and got drunk in the inn on the way. Then he took the key, opened the shackles, took the cangue to the chief, shaved the head of the chief and ran away.

The most common deductive reasoning is syllogism, that is, explain A in one sentence, explain B in another sentence, and finally get the conclusion of C. Three propositions are combined to form syllogism, and the full name proposition constitutes the full name syllogism.

The full name proposition is everything. For example, the bald heads in the story are all monks, which is a wrong full-name proposition.

The best way to master syllogism is to draw three propositions in syllogism into three circles, and then see what kind of inclusive relationship between these three circles. Is it crossed? Or separated? Mastering these, the logic of syllogism will be imprinted in the brain.

(To be continued, preview in the next section: full name proposition)