Chapter 9 <A person has three heads>

Someone A said to someone B: I can prove that a person has three heads. B said: I would like to hear high opinions. A said: Everyone has one head, no one has two heads, and one person has one more head than no one, so a person has three heads. Although B knows that A's argument is wrong, he cannot point out where it is wrong. In A’s argument, literally, the word “nobody” appears twice, but the meanings expressed are different. In no one has two heads, no is a negative word, which negates the judgment that someone has two heads, which means that no one has two heads.The subject of this universal negative judgment is man, not no man; and in the one more head than no man, the negative word no no negates the concept of man, so what no man expresses here is an independent negative concept no man , that is, there is no one.If nobody in front means the same as nobody in the back, then it is a false judgment that nobody has two heads.Therefore, A's argument is to use the same words or words to secretly change the concept, thus drawing absurd conclusions.