Authors: Dinčić, Nebojša
Đorđević, Bogdan 
Affiliations: Mathematics 
Mathematical Institute of the Serbian Academy of Sciences and Arts 
Title: On the intrinsic structure of the solution set to the Yang–Baxter-like matrix equation
Journal: Revista de la Real Academia de Ciencias Exactas, Fisicas y Naturales - Serie A: Matematicas
Volume: 116
Issue: 2
First page: 73
Issue Date: 1-Apr-2022
Rank: ~M21a
ISSN: 1578-7303
DOI: 10.1007/s13398-022-01214-8
Abstract: 
In this paper we analyze isolated and connected points of the solution set to the Yang–Baxter-like matrix equation AXA= XAX. In particular, if A is a regular matrix, we prove that the trivial solution X= 0 is always isolated in the solution set, while the trivial solution X= A is isolated under some natural conditions, and an example shows that these conditions cannot be omitted. Conversely, we demonstrate that the two trivial solutions can be path-connected in the solution set when A is singular. Furhter, we prove that every nontrivial non-commuting solution is always contained in some path-connected subset of the solution set, regardless of whether A is regular or singular. Additionally, we develop new methods for obtaining infinitely many new nontrivial non-commuting solutions (for both regular and singular A). Explicit examples are provided after almost every theoretical result.
Keywords: Generalized inverses | Nonlinear matrix equations | Sylvester equation | Yang–Baxter-like matrix equation
Publisher: Springer Link

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