# Definitions for center (group theory)cen·ter (group the·o·ry)

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1. Center (group theory)

In abstract algebra, the center of a group, G, is the set of elements that commute with every element of G. It is denoted Z(G), from German Zentrum, meaning center. In set-builder notation, Z(G) = {z ∈ G | ∀g ∈ G, zg = gz}.The center is a normal subgroup, Z(G) ⊲ G. As a subgroup, it is always characteristic, but is not necessarily fully characteristic. The quotient group, G / Z(G), is isomorphic to the inner automorphism group, Inn(G). A group G is abelian if and only if Z(G) = G. At the other extreme, a group is said to be centerless if Z(G) is trivial; i.e., consists only of the identity element. The elements of the center are sometimes called central.

### Numerology

1. Chaldean Numerology

The numerical value of center (group theory) in Chaldean Numerology is: 2

2. Pythagorean Numerology

The numerical value of center (group theory) in Pythagorean Numerology is: 8

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"center (group theory)." Definitions.net. STANDS4 LLC, 2023. Web. 30 May 2023. <https://www.definitions.net/definition/center+%28group+theory%29>.

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