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Null function can also refer to the null function in mathematics[1], there is a need to indicate that the null function here is related to computer science in the title of this article; the title should be "ull function (computer science)" the same as the article "Null(computer science)".
not serious edit
The article has contradictions. First it is said that the zero function is a subroutine, then it is said that it "is a (computer) function", defined on the set of states, that leaves all of these unchanged. But a computer function does not have as arguments the set of states, but input values, and the result ("image") of the computer function is also not a state. In any case, it cannot be both, a subroutine and a function defined on the set of states. — MFH:Talk 00:55, 20 January 2023 (UTC)