Talk:Derivation of the conjugate gradient method

Conjugate Gradient method is not derived here

This is not a derivation at all. This just lists what to do to do this method. Where does the quadratic equation f(x)=(b-x)^T A (b-x) come from? You can't call this a derivation and start with a function. The derivation should lead to this equation, and also lead to the expressions for alpha and p. Also, why is it that you want to minimize this function? What does this function represent that the entire method is based on minimizing this function? After reading a derivation, it should be clear where all this comes from. This is like saying, 'this is what works, therefore it is derived.'