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arXiv · 2609.22825

The $ϕ$-conjugation of quaternionic matrices and generalized Autonne-Takagi factorization

Cailing Yao·Bingzhe Hou·Yue Xin
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Abstract

Let $ϕ$ be a quaternion of modulus $1$. In this article, we study some topics related to $ϕ$-conjugation for quaternionic matrices, including $ϕ$-Hermitian matrices, $ϕ$-conjugate normal matrices, unitary $ϕ$-congruence and $ϕ$-HSH decomposition (decomposition of a $ϕ$-Hermitian matrix and a skew $ϕ$-Hermitian matrix). In particular, we generalize the Autonne-Takagi factorization of quaternion $ϕ$-Hermitian matrices for all unit quaternion $ϕ$. This gives an affirmative answer to a problem proposed by R. Horn and F. Zhang in the paper ``A generalization of the complex Autonne-Takagi factorization to quaternion matrices, Linear Multilinear A. 60: 1239--1244, 2012''.

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Cailing Yao, Bingzhe Hou, Yue Xin. 2026-09-29. The $ϕ$-conjugation of quaternionic matrices and generalized Autonne-Takagi factorization. https://arxiv.org/abs/2609.22825

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