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arXiv · 2503.01166

Simultaneous block diagonalization of a set of symmetric matrices via congruence

Lishan Fang·Hua-Lin Huang·Jiayan Huang
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Abstract

This article studies canonical forms derived from the finest simultaneous block diagonalization of a set of symmetric matrices via congruence. Our technique relies on Harrison's center theory, which is extended from a single higher degree form to multiple quadratic forms, hence a set of symmetric matrices. The algebraic structures of centers and the bijective relationship between the simultaneous block diagonalization via congruence and complete sets of orthogonal idempotents of centers are investigated. We provide an algorithm that mainly uses standard linear algebra tasks and several examples to demonstrate its effectiveness. In addition, this technique can be extended verbatim to the simultaneous block diagonalization of a set of Hermitian matrices via $*$-congruence.

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Lishan Fang, Hua-Lin Huang, Jiayan Huang. 2025-12-19. Simultaneous block diagonalization of a set of symmetric matrices via congruence. https://doi.org/10.1016/j.laa.2026.02.016

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