Normal coactions of discrete groups extend to the C*-envelope of the operator algebra, resolving an open problem and identifying the C*-envelopes of operator algebras of groupoid-embeddable categories and cancellative right LCM monoids.
Arveson, Notes on the unique extension property, https://math.berkeley.edu/ arveson/Dvi/unExt.pdf
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Normal coactions extend to the C*-envelope
Normal coactions of discrete groups extend to the C*-envelope of the operator algebra, resolving an open problem and identifying the C*-envelopes of operator algebras of groupoid-embeddable categories and cancellative right LCM monoids.