Geodesic
Homotopy of projections and factorization in the unitary group of certain C*-algebras.
Mathematica Scandinavica, Tome 73 (1993) no. 2, pp. 281-306.

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Mots-clés : every unitary element in the matrix algebra, multiplier algebra, product of a diagonal unitary and some symmetries, homotopy of projection, topological stable rank, factorizations of unitary elements 
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     author = {Shuang Zhang},
     title = {Homotopy of projections and factorization in the unitary group of certain {C*-algebras.}},
     journal = {Mathematica Scandinavica},
     pages = {281--306},
     publisher = {mathdoc},
     volume = {73},
     number = {2},
     year = {1993},
     zbl = {0808.46085},
     url = {http://geodesic.mathdoc.fr/item/MS2_1993__73_2_167273/}
}
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Shuang Zhang. Homotopy of projections and factorization in the unitary group of certain C*-algebras.. Mathematica Scandinavica, Tome 73 (1993) no. 2, pp. 281-306. http://geodesic.mathdoc.fr/item/MS2_1993__73_2_167273/