A 
-element
of a group 
is semisimple if 
, where 
is the commuting product of all components of 
and 
is the centralizer of
.
Semisimple Element
See also
Centralizer, p-ElementExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Semisimple Element." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SemisimpleElement.html