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Adjacency Preserving Bijection Maps of Hermitian Matrices over any Division Ring with an Involution

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Abstract

Let D be any division ring with an involution, ℋ n (D) be the space of all n × n hermitian matrices over D. Two hermitian matrices A and B are said to be adjacent if rank(A B) = 1. It is proved that if ϕ is a bijective map from ℋ n (D)(n ≥ 2) to itself such that ϕ preserves the adjacency, then ϕ −1 also preserves the adjacency. Moreover, if ℋ n (D\({\fancyscript S}\) 3(\({\fancyscript F}\) 2), then ϕ preserves the arithmetic distance. Thus, an open problem posed by Wan Zhe–Xian is answered for geometry of symmetric and hermitian matrices.

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Correspondence to Li Ping Huang.

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This work is supported by the National Natural Science Foundation of China Grant #10271021

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Huang, L.P. Adjacency Preserving Bijection Maps of Hermitian Matrices over any Division Ring with an Involution. Acta Math Sinica 23, 95–102 (2007). https://doi.org/10.1007/s10114-005-0770-7

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