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On bases and the dimensions of twisted centralizer codes
Ahmad Muchlis, Galih Pradananta, Pudji Astuti, Djoko Suprijanto · 2021-10-05 · via cs.IT updates on arXiv.org

Alahmadi et al. ["Twisted centralizer codes", \emph{Linear Algebra and its Applications} {\bf 524} (2017) 235-249.] introduced the notion of twisted centralizer codes, $\mathcal{C}_{\mathbb{F}_q}(A,γ),$ defined as \[ \mathcal{C}_{\mathbb{F}_q}(A,γ)=\lbrace X \in \mathbb{F}_q^{n \times n}:~\ AX=γXA\rbrace, \] for $A \in \mathbb{F}_q^{n \times n},$ and $γ\in \mathbb{F}_q.$ Moreover, Alahmadi et al. ["On the dimension of twisted centralizer codes", \emph{Finite Fields and Their Applications} {\bf 48} (2017) 43-59.] also investigated the dimension of such codes and obtained upper and lower bounds for the dimension, and the exact value of the dimension only for cyclic or diagonalizable matrices $A.$ Generalizing and sharpening Alahmadi et al.'s results, in this paper, we determine the exact value of the dimension as well as provide an algorithm to construct an explicit basis of the codes for any given matrix $A.$

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