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→External links: clean up & uniformity
*We have <math>Z(G) = G</math> if and only if <math>G</math> is an [[abelian group]].
*We have <math>Z(G) = G</math> if and only if <math>G</math> is an [[abelian group]].
==External Links==
==External links==
*[http://mathworld.wolfram.com/GroupCenter.html Center] on MathWorld
*[http://mathworld.wolfram.com/GroupCenter.html Center] on MathWorld
[[Category:Algebra]]
[[Category:Algebra]]