Partial actions of groups and actions of inverse semigroups
| dc.creator | Exel, Ruy | |
| dc.date | 1995-11-27 | |
| dc.date.accessioned | 2026-07-07T09:13:34Z | |
| dc.date.available | 2026-07-07T09:13:34Z | |
| dc.description | Given a group G, we construct, in a canonical way, an inverse semigroup S(G) associated to G. The actions of S(G) are shown to be in one-to-one correspondence with the partial actions of G, both in the case of actions on a set, and that of actions as operators on a Hilbert space. In other words, G and S(G) have the same representation theory. We show that S(G) governs the subsemigroup of all closed linear subspaces of a G-graded C*-algebra, generated by the grading subspaces. In the special case of finite groups, the maximum number of such subspaces is computed. A ``partial'' version of the group C*-algebra of a discrete group is introduced. While the usual group C*-algebra of finite commutative groups forgets everything but the order of the group, we show that the partial group C*-algebra of the two commutative groups of order four, namely Z/4 and Z/2+Z/2, are not isomorphic. | |
| dc.description | 15 pages, plain TeX, no figures | |
| dc.identifier | https://arxiv.org/abs/funct-an/9511003 | |
| dc.identifier | http://arxiv.org/abs/funct-an/9511003 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/152372 | |
| dc.subject | Functional Analysis | |
| dc.subject | Operator Algebras | |
| dc.title | Partial actions of groups and actions of inverse semigroups | |
| dc.type | text |