کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6416520 | 1336832 | 2013 | 7 صفحه PDF | دانلود رایگان |
In [S.K. Hwang, S.S. Pyo, The inverse eigenvalue problem for symmetric doubly stochastic matrices, Linear Algebra Appl. 379 (2004) 77-83] it was claimed that: if 1>λ2⩾λ3⩾â¯â©¾Î»n and 1n+λ2n(nâ1)+λ3(nâ1)(nâ2)+â¯+λn2â 1⩾0, then there is a symmetric positive doubly stochastic matrix A with the eigenvalues 1,λ2,λ3,â¦,λn. Afterwards, Fang [M.Z. Fang, A note on the inverse eigenvalue problem for symmetric doubly stochastic matrices, Linear Algebra Appl. 432 (2010) 2925-2927] presented a counterexample to demonstrate that the above proposition was inaccurate. However, the author did not give a solution for a real n-tuple Ï=(1,λ2,λ3,â¦,λn) to be the spectrum of a symmetric positive doubly stochastic matrix of order n. In this paper, we give some sufficient conditions to make up for this deficiency.
Journal: Linear Algebra and its Applications - Volume 439, Issue 8, 15 October 2013, Pages 2256-2262