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\ntriangleleft

The symbol \ntriangleleft is used to denote that one element is not a normal subgroup of another in group theory. It is the negation of the \triangleleft symbol, which indicates a normal subgroup relation.

Examples

H is not a normal subgroup of G

H \ntriangleleft G

K is not a normal subgroup of L

K \ntriangleleft L

N is not a normal subgroup of M

N \ntriangleleft M