Geodesic
The generalized Wielandt inequality in inner product spaces
Eurasian mathematical journal, Tome 3 (2012) no. 1, pp. 72-85

Voir la notice de l'article provenant de la source Math-Net.Ru

A new inequality between angles in inner product spaces is formulated and proved. It leads directly to a concise statement and proof of the generalized Wielandt inequality, including a simple description of all cases of equality. As a consequence, several recent results in matrix analysis and inner product spaces are improved. 
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M. Lin; G. Sinnamon. The generalized Wielandt inequality in inner product spaces. Eurasian mathematical journal, Tome 3 (2012) no. 1, pp. 72-85. http://geodesic.mathdoc.fr/item/EMJ_2012_3_1_a5/