The center of a Lie algebra g is the set of all vectors x such that [x, y]= 0 for all y in g.

Center(Alg) calculates the center of the Lie algebra g defined by Alg.  If no argument is given, then the center of the current Lie algebra is found.

A list of vectors defining a basis for the center of g is returned.  If the center is trivial, then an empty list is returned.

The command Center is part of the DifferentialGeometry:-LieAlgebras package.  It can be used in the form Center(...) only after executing the commands with(DifferentialGeometry) and with(LieAlgebras), but can always be used by executing DifferentialGeometry:-LieAlgebras:-Center(...).