Geodesic
Selected topics of the theory of orthogonal decomposition of associative algebras
Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 1, pp. 187-197.

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The notion of orthogonal decomposition of associative algebra envelopes such well-known themes as finite affine planes, Hadamard matrices, finite groups with partition, orthogonal decompositions of simple Lie algebras of type $A_n$ into the sum of Cartan subalgebras. Some new problems and results concerning this notion are introduced. 
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     title = {Selected topics of the theory of orthogonal decomposition of associative algebras},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
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     url = {http://geodesic.mathdoc.fr/item/FPM_1998_4_1_a15/}
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D. N. Ivanov. Selected topics of the theory of orthogonal decomposition of associative algebras. Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 1, pp. 187-197. http://geodesic.mathdoc.fr/item/FPM_1998_4_1_a15/