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Eigenvalues of words in two positive definite letters. (English) Zbl 1007.68139

MSC:
68R15 Combinatorics on words
81Q99 General mathematical topics and methods in quantum theory
20F10 Word problems, other decision problems, connections with logic and automata (group-theoretic aspects)
15A42 Inequalities involving eigenvalues and eigenvectors
15A23 Factorization of matrices
15A90 Applications of matrix theory to physics (MSC2000)
15B57 Hermitian, skew-Hermitian, and related matrices
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