Normal Subgroup

(redirected from Normal subgroups)

normal subgroup

[′nȯr·məl ′səb‚grüp]
A subgroup N of a group G where every expression g -1 ng is in N for every g in G and every n in N. Also known as invariant subgroup; normal divisor.

Normal Subgroup


(also normal divisor of a group, invariant subgroup), a fundamental concept of group theory, which was introduced by E. Galois. A normal subgroup of a group G is a subgroup H for which gH = Hg for arbitrary element g of group G.

References in periodicals archive ?
This first of two volumes covers basic concepts, characters, arithematical properties of characters, products of characters, induced characters and representations, projective representations, Clifford theory, Brauer's induction theorems, faithful characters, the existence of normal subgroups, and sums of degrees of irreducible characters.
Even the naive translation of normal subgroups to normal Hopf subalgebras is problematic.
Giving answer to Herstiens's problem, Laffey proved that A(G) = 1 provided G has no non-trivial abelian normal subgroups [8].
05) while the levels of the single-branch stenosis and normal subgroups were similar (P greater than 0.
Given a prime p, a group is called residually p if the intersection of its p-power index normal subgroups is trivial, and called virtually residually p if it has a finite index subgroup that is residually p.
Thomas: A complete study of the lattices of fuzzy congruences and normal subgroups, Information Sciences, 82(1995), 197-218.
In the case of normal subgroups, one can see even more from the colored group table.
Topics covered include counting of subgroups and proof of the main counting theorems, regular p-groups and regularity criteria, p-groups of maximal class and their characterizations, characters of p-groups, p-groups with large Schur multiplier and commutator subgroups, (p--1)- admissible Hall chains in normal subgroups, powerful p-groups, automorphisms of p-groups, p-groups that have nonnormal subgroups that are all cyclic, and Alberin's problem of abelian subgroups of small index.
Having studied groups, subgroups, normal subgroups, and factor groups, it is time to develop a library of examples.
Q], being restrictions of characters in [Mathematical Expression Omitted] to normal subgroups of [g.
His topics include the Schur-Zassenhaus theorem: a bit of history and motivation, abelian and minimal normal subgroups, normal subgroups with abelian sylow subgroups, and groups with specific classes of subgroups complemented.