Who developed conjugate gradient method?

Who developed conjugate gradient method? Correct Answer Hestenes and Stiefel

Magnus Hestenes and Eduard Stiefel introduced the conjugate gradient algorithm. It is used for advanced optimization. Broyden, Fletcher, Goldfarb and Shannon invented BFGS algorithm. Leslie Valiant introduced the idea of PAC Learning. Vapnik and Chervonenkis was the founder of VC dimension.

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