It was proved by Valenti and Zaicev, in 2011, that, if G is an abelian group and K is an algebraically closed field of characteristic zero, then any G-grading on the algebra of upper block triangular matrices over
It was proved by Valenti and Zaicev, in 2011, that, if G is an abelian group and K is an algebraically closed field of characteristic zero, then any G-grading on the algebra of upper block triangular matrices over
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