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Hi, the unwritten law in mathematics is that if the second factor of a product begins with a digit, then one must use the multiplication mark between first and second factor (e.g. x5 and m2^m are forbidden; 5x and 2^mm are permitted).

It were good to say that "m is a _positive_ integer".

Thanks.

Parting words from the person who closed the correction:

Hi, the unwritten law in mathematics is that if the second factor of a product begins with a digit, then one must use the multiplication mark between first and second factor (e.g. x5 and m2^m are forbidden; 5x and 2^mm are permitted).
It were good to say

**Status:**Accepted

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