摘要
设C是复数域,R是实数域,H_n(C)是复数域上所有n阶Hermite矩阵构成的线性空间,映射Φ:H_n(C)→M_n(C)称为是保持幂等关系的,如果对任意的A,B∈H_n(C)和λ∈R,都有A-λB幂等当且仅当Φ(A)-λΦ(B)幂等。证明了:若Φ:H_n(C)→H_n(C),则Φ是一个保持幂等关系的映射,当且仅当存在M_n(C)中的一个可逆阵P,使得Φ(A)=PAP^(-1),A∈H_n(C),或Φ(A)=PA^TP^(-1),A∈H_n(C),其中P满足P^TP=a I_n,a为R中的一个非零元。
Suppose C is the field of all complex numbers, and R is the field of all real numbers. Let Hn (C) be the set consisting of all Hermitian matrices. A map Ф: Hn (C) →Hn(C) is said to preserve idempotence if A-λB is idempotent if and only if Ф (A) -λФ (B) is idempotent for any A, B ∈ Hn (C) and A E R. It is shown that Ф: Hn (C) →Hn (C) is a map preserving idempotence if and only if there exists an invertible matrix P ∈ Mn(C) such that either Ф(A) = PAP^-1 for every A ∈ Hn(C) , or Ф(A) = PA^TP^-1 for every A ∈ Hn(C) , and P^TP = aIn for some nonzero scalar a in R.
出处
《黑龙江大学自然科学学报》
CAS
北大核心
2017年第3期259-263,共5页
Journal of Natural Science of Heilongjiang University
基金
Supported by the National Natural Science Foundation of China(11526084
11601135)
the Natural Science Foundation of Heilongjiang Province(A2015007)
the Education Department of Heilongjiang Province(12541605)