Let A,A1,A2, ..,An. be given n × n Hermitian matrices and λ1,λ2,…λn be given n real numbers. With the help of Brouwer’s fixed point theorem, we present new sufficient conditions under which there exist n real nu...
§1.引言 本文讨论下述特征值反问题的可解性: 问题 G.设A_0=(a_(ij)^((0)))和A_k=(a_(ij)^((k)))(k=1,…,n)是一组n+1个n×n实对称矩阵,λ_1,…,λ_n是n个不同的实数.求实数c_1,…,c_n使得矩阵A_0+sum from k-1 to n C_k·A_k的特征值...