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已经做出来了
http://latex.codecogs.com/gif.latex?\xi&space;^{T}A\xi-(\lambda&space;\xi&space![](\"https://muchongimg.xmcimg.com/data/emuch_bbs_images/smilies/wink.gif\") &space;^{T}A(\lambda&space;\xi&space>0&space;~then~(1-\lambda&space;^{2})\xi&space;^{T}A\xi>0,&space;\\Because&space;~A~is~a~positive~Matrix,&space;infer~that~\xi&space;^{T}A\xi>0,\\~therefore~1-\lambda&space;^{2}>0,~here~\lambda&space;~is~a~&space;real~&space;number,\\&space;so&space;-1<\lambda<1,~the~proof&space;~is~complete. |
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