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If on
and
on
are irreducible representations and
is a linear map such that
for all
and group
, then
or
is invertible. Furthermore, if
, then
is
a Scalar.
References
Knapp, A. W. ``Group Representations and Harmonic Analysis, Part II.'' Not. Amer. Math. Soc. 43, 537-549, 1996.