Geodesic
Range of a contractive strongly positive projection in a $C^*$-algebra
Andrzej Łuczak1
1 Faculty of Mathematics and Computer Science Łódź University S. Banacha 22 90-238 Łódź, Poland
Colloquium Mathematicum, Tome 140 (2015) no. 1, pp. 87-89

Voir la notice de l'article provenant de la source Institute of Mathematics Polish Academy of Sciences

We generalize a result of Choi and Effros on the range of a contractive completely positive projection in a $C^*$-algebra to the case when this projection is only strongly positive using, moreover, an elementary argument instead of a $2\times 2$-matrix technique.
DOI : 10.4064/cm140-1-7
Keywords: generalize result choi effros range contractive completely positive projection * algebra projection only strongly positive using moreover elementary argument instead times matrix technique

Andrzej Łuczak 1

1 Faculty of Mathematics and Computer Science Łódź University S. Banacha 22 90-238 Łódź, Poland 
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Andrzej Łuczak. Range of a contractive strongly positive projection in a $C^*$-algebra. Colloquium Mathematicum, Tome 140 (2015) no. 1, pp. 87-89. doi: 10.4064/cm140-1-7

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