A mathematical function, f, is a mapping from an m-dimensional space, S (the domain), to an n-dimensional space, T, such that for every element in S there is one element in T. This may be denoted by f(x1, x2, ... , xm) = (y1, y2, ... , yn)
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Neither, it is a mathematical discipline.
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Just writing "81" is mathematical enough for my taste. After all, that's a number, and numbers are mathematical.
1,427,000,000
find it yourself okay jesus