Primary Representation
Let 
be a unitary Representation of a Group 
on a separable Hilbert Space, and let 
be the smallest weakly closed algebra of bounded linear operators containing all 
for 
.Then is primary if the center of consists of only scalar operations.
References
Knapp, A. W. ``Group Representations and Harmonic Analysis, Part II.'' Not. Amer. Math. Soc. 43, 537-549, 1996.
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