Geodesic
On commutativity of projectors
Discussiones Mathematicae. Probability and Statistics, Tome 28 (2008) no. 1, pp. 157-165

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It is shown that commutativity of two oblique projectors is equivalent with their product idempotency if both projectors are not necessarily Hermitian but orthogonal with respect to the same inner product.
Keywords: oblique projector, orthogonal projector, commutativity 
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Kala, Radosław. On commutativity of projectors. Discussiones Mathematicae. Probability and Statistics, Tome 28 (2008) no. 1, pp. 157-165. http://geodesic.mathdoc.fr/item/DMPS_2008_28_1_a7/