Geodesic
Products of orthoprojectors and a theorem of Crimmins
Zapiski Nauchnykh Seminarov POMI, Computational methods and algorithms. Part XXIV, Tome 395 (2011), pp. 75-85 Cet article a éte moissonné depuis la source Math-Net.Ru

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A proof of the following result, due to T. Crimmins, is proposed: A matrix $A\in M_n(\mathbf C)$ can be represented as a product of orthoprojectors $P$ and $Q$ if and only if $A$ satisfies the equation $A^2=AA^*A$. 
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     title = {Products of orthoprojectors and a~theorem of {Crimmins}},
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Kh. D. Ikramov. Products of orthoprojectors and a theorem of Crimmins. Zapiski Nauchnykh Seminarov POMI, Computational methods and algorithms. Part XXIV, Tome 395 (2011), pp. 75-85. http://geodesic.mathdoc.fr/item/ZNSL_2011_395_a7/

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