EndomorphismAlgebra(G) : GrpMat -> AlgMat
For an integral or rational matrix group G, return the endomorphism ring
(i.e. the commuting algebra) of G as a subalgebra of Mn(Z) or
Mn(Q) respectively.
CentreOfEndomorphismAlgebra(G) : GrpMat -> AlgMat
For an integral or rational matrix group G, return the center of the
endomorphism ring (i.e. the commuting algebra) of G as a subalgebra of
Mn(Z) or Mn(Q) respectively.
Return the dimension of the endomorphism ring of an integral or rational
matrix group G by a modular method.
Return the dimension of the centre of the endomorphism ring of an integral
or rational matrix group G by a modular method.
For an integral or rational matrix group G, return a sequence containing
n independent endomorphisms of G.
n must be in the range [0 .. d], where d is the dimension of the
endomorphism ring of G.
For an integral or rational matrix group G, return a sequence containing
n independent central endomorphisms of G.
n must be in the range [0 .. d], where d is the dimension of the
centre of the endomorphism ring of G.
V2.28, 13 July 2023