Geodesic
Cebysev subspaces of C*-algebras.
Mathematica Scandinavica, Tome 45 (1979), pp. 147-156

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Mots-clés : best approximation, C*-algebras, Cebysev subspace, pure states 
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     author = {Gert Kjaergard Petersen},
     title = {Cebysev subspaces of {C*-algebras.}},
     journal = {Mathematica Scandinavica},
     pages = {147--156},
     publisher = {mathdoc},
     volume = {45},
     year = {1979},
     zbl = {0432.46060},
     url = {http://geodesic.mathdoc.fr/item/MS2_1979__45_166670/}
}
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Gert Kjaergard Petersen. Cebysev subspaces of C*-algebras.. Mathematica Scandinavica, Tome 45 (1979), pp. 147-156. http://geodesic.mathdoc.fr/item/MS2_1979__45_166670/