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I have a question like how can we mathematically prove that for a general matrix Conjugate Gradient method will always converge within n steps in exact arithmetic ? where n is the size of the matrix.

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    [You are welcome!](http://www.cs.cmu.edu/~quake-papers/painless-conjugate-gradient.pdf)2012-11-17
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    That paper Inquest posted is really good2012-11-18

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