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• W2079846972 abstract "Let S(X, B) be a symmetric (‘palindromic’) word in two letters X and B. A theorem due to Hillar and Johnson states that for each pair of positive definite matrices B and P, there is a positive definite solution X to the word equation S(X, B)=P. They also conjectured that these solutions are finite and unique. In this paper, we resolve a modified version of this conjecture by showing that the Brouwer degree of such an equation is equal to 1 (in the case of real matrices). It follows that, generically, the number of solutions is odd (and thus finite) in the real case. Our approach allows us to address the more subtle question of uniqueness by exhibiting equations with multiple real solutions, as well as providing a second proof of the result of Hillar and Johnson in the real case." @default.
• W2079846972 created "2016-06-24" @default.
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• W2079846972 date "2007-11-20" @default.
• W2079846972 modified "2023-10-16" @default.
• W2079846972 title "Solvability of symmetric word equations in positive definite letters" @default.
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• W2079846972 doi "https://doi.org/10.1112/jlms/jdm070" @default.
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