Two representations of a group and
are said to be orthogonal if
for ,
where the sum is over all elements
of the representation.
Two representations of a group and
are said to be orthogonal if
for ,
where the sum is over all elements
of the representation.
Weisstein, Eric W. "Orthogonal Group Representations." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/OrthogonalGroupRepresentations.html