On the extension of unitary group isomorphisms of unital UHF-algebras
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Type I
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H. Dye showed that an isomorphism between the (discrete) unitary groups in two factors not of type In is implemented by a linear (or a conjugate linear) *-isomorphism of the factors. If φ is an isomorphism between the unitary groups of two unital C*-algebras, it induces a bijective map θφ between the sets of projections. For certain UHF-algebras, we construct an automorphism φ of their unitary group, such that θφ does not preserve the orthogonality of projections. For a large class of unital finite C*-algebras, we show that θφ is always an orthoisomorphism. If φ is a continuous automorphism of the unitary group of a UHF-algebra A, we show that φ is implemented by a linear or a conjugate linear *-automorphism of A.
1994 ◽
Vol 14
(2)
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pp. 1500-1509
1997 ◽
Vol 125
(9)
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pp. 2671-2676
2003 ◽
Vol 6
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pp. 162-197
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1966 ◽
Vol 72
(3)
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pp. 508-513
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2001 ◽
Vol 12
(07)
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pp. 813-845
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2012 ◽
Vol 56
(1)
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pp. 1-12
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