\nmidThe symbol \nmid is used in mathematics to denote that one number does not divide another. It is the negation of the divisibility relation, which is represented by the symbol | (mid).
Indicates that 'a' does not divide 'b'.
a \nmid bThe number 5 does not divide 12.
5 \nmid 12The expression n^2 + 1 does not divide n^3 - n.
n^2 + 1 \nmid n^3 - n