A E0A与AE0A的有定及不定问题

The Definite and Indefinite Properties of A￣*E_0A and AE_0A￣*

本文研究了Ｈｅｒｍｉｔｅ阵Ａ￣＊Ｅ＿０Ａ与ＡＥ＿０Ａ￣＊的有定性及不定性问题，并给出具体的判定方法．其中Ａ是任何ｍ×ｎ阶矩阵．

In this paper, the positive, positive semidefinite, negative,negativesemidefinite and indefinite problems of matrices A￣*E_0A and AE_0A￣* have beenstudied.Where A is any m-by-n matrix and E_0 is “backward identity” matrix.