The Conjugate Gradient Method without the Agonizing Pain https://www.cs.cmu.edu/~quake-papers/painless-conjugate-gradient.pdf https://www.cs.cmu.edu/~quake-pape

The Conjugate Gradient Method without the Agonizing Pain https://www.cs.cmu.edu/~quake-papers/painless-conjugate-gradient.pdf https://www.cs.cmu.edu/~quake-papers/painless-conjugate-grad... Presents a really nice conceptual/intuitive explanation of how/why it works, rather than the traditional algebra based definition/proof you get in many linear algebra courses.