Commutative matrix subalgebras generated by nonderogatory matrices. (English. Russian original) Zbl 1539.15022
J. Math. Sci., New York 281, No. 2, 297-305 (2024); translation from Zap. Nauchn. Semin. POMI 524, 112-124 (2023).
Summary: The paper is devoted to the problem of determining the number of subalgebras in the matrix algebra that are generated by nonderogatory matrices and are distinct up to similarity. A similarity criterion in terms of isomorphism of quotient algebras of the algebra of polynomials for matrix algebras of the type indicated is established. The existence of infinite fields for which the number of distinct algebras is infinite for all values of the matrix order is proved. For algebraically closed fields, the field of reals, and finite fields of sufficiently large cardinalities, the number of distinct algebras generated by nonderogatory matrices is determined as a function of the matrix order.
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OEISReferences:
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