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Abstract:
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We define equivariant semiprojectivity for C* -algebras equipped with actions of compact groups. We prove that the following examples are equivariantly semiprojective:
A. Arbitrary finite dimensional C*-algebras with arbitrary actions of compact groups. -
B. The Cuntz algebras Od and extended Cuntz algebras Ed, for finite d, with quasifree actions of compact groups. -
C. The Cuntz algebra O∞ with any quasifree action of a finite group.
For actions of finite groups, we prove that equivariant semiprojectivity is equiv-
alent to a form of equivariant stability of generators and relations. We also
prove that if G is finite, then C*(G) is graded semiprojective. |