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- W3100850003 abstract "In this paper we discuss the notion of reducibility for matrix weights and introduce a real vector space $mathcal C_mathbb{R}$ which encodes all information about the reducibility of $W$. In particular a weight $W$ reduces if and only if there is a non-scalar matrix $T$ such that $TW=WT^*$. Also, we prove that reducibility can be studied by looking at the commutant of the monic orthogonal polynomials or by looking at the coefficients of the corresponding three term recursion relation. A matrix weight may not be expressible as direct sum of irreducible weights, but it is always equivalent to a direct sum of irreducible weights. We also establish that the decompositions of two equivalent weights as sums of irreducible weights have the same number of terms and that, up to a permutation, they are equivalent. We consider the algebra of right-hand-side matrix differential operators $mathcal D(W)$ of a reducible weight $W$, giving its general structure. Finally, we make a change of emphasis by considering reducibility of polynomials, instead of reducibility of matrix weights." @default.
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- W3100850003 date "2016-10-21" @default.
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- W3100850003 title "Reducibility of matrix weights" @default.
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- W3100850003 doi "https://doi.org/10.1007/s11139-016-9834-9" @default.
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