1994 1 1 In the Mathematical Symbols Used in People's Republic of China (PRC) National Standard Physics Science and Technology issued by the State Bureau of Technical Supervision, natural number set was recorded as
N={0, 1,2,3,…}
The original set of natural numbers is called the set of non-zero natural numbers.
N+ (or n *) = {1, 2,3, ...}.
That is to say, there is an element 0 in the high school natural number set.