The Normalizer N(a) of a is an element of group G is a subgroup of G - in group theory.....(B.sc)

Normalizer N(a) of an element of group G: If (G,o) be a group & a belong to G be an arbitrary element ,then, the normalizer of a i.e.N(a) is the set of those element of G with commute with a.
Symbolically :- N(a) = { x / ax = xa , x € G }
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