Geodesic
On product of projections
Archivum mathematicum, Tome 40 (2004) no. 4, pp. 355-357.

Voir la notice de l'article provenant de la source Czech Digital Mathematics Library

An operator with infinite dimensional kernel is positive iff it is a positive scalar times a certain product of three projections.
Classification : 47A05, 47A68, 47B15
Keywords: projection; positive operator; factorization 
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Moslehian, Mohammad Sal. On product of projections. Archivum mathematicum, Tome 40 (2004) no. 4, pp. 355-357. http://geodesic.mathdoc.fr/item/ARM_2004__40_4_a3/