The complete version of Kursov’s theorem for matrices over division rings

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Abstract

Let D be a division ring with center F, and let n > 1 be an integer. A known result due to Kursov asserts that if D is finite-dimensional over F, then the commutator width of the general linear group GLn(D) is at most one greater than that of GLn(D). In the absence of the finite-dimensionality assumption, recent research has made significant progress, though the developments typically cease once F is infinite or D is algebraic over F. The purpose of this paper is to show that these restrictions are, in fact, unnecessary.

Tran, N.S. (2026) Linear Algebra and its Applications, 728, pp. 376–382.

DOI: https://doi.org/10.1016/j.laa.2025.09.015