0 is not a natural number: how to express 0 in nature? Nothing means nothing, so 0 is not a natural number.
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Anyway, when we used to teach, the book said it was not a natural number ... well ... I looked it up online.
Historically, there have been two regulations at home and abroad about whether 0 is a natural number: one stipulates that 0 is a natural number, and the other stipulates that 0 is not a natural number. Since the founding of the People's Republic of China, the textbooks of primary and secondary schools in China have always stipulated that the set of natural numbers does not include 0.
At present, most foreign mathematicians stipulate that 0 is a natural number. In order to facilitate international exchanges, national standards stipulate that natural number set includes 0. Therefore, in our newly published textbooks, this treatment is carried out in accordance with national standards, and the original natural number set is now called positive integer set.