Geodesic
Strong Extensions vs. Weak Extensions of C *-Algebras
Canadian mathematical bulletin, Tome 21 (1978) no. 2, pp. 143-147

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Let be a separable complex infinite dimensional Hilbert space, the algebra of bounded operators in the ideal of compact operators, and the quotient map. Throughout this paper A denotes a separable nuclear C*-algebra with unit. An extension of A is a unital *-monomorphism of A into . Two extensions τ1 and τ2 are strongly (weakly) equivalent if there exists a unitary (Fredholm partial isometry) U in such that for all a in A. 
Cho, S. J. Strong Extensions vs. Weak Extensions of C *-Algebras. Canadian mathematical bulletin, Tome 21 (1978) no. 2, pp. 143-147. doi: 10.4153/CMB-1978-025-4
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     author = {Cho, S. J.},
     title = {Strong {Extensions} vs. {Weak} {Extensions} of {C} {*-Algebras}},
     journal = {Canadian mathematical bulletin},
     pages = {143--147},
     year = {1978},
     volume = {21},
     number = {2},
     doi = {10.4153/CMB-1978-025-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1978-025-4/}
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