Here's symbolic differentiation done in ~20 lines of Haskell: https://www.quora.com/What-are-20-lines-of-code-that-capture-the-essence-of-Haskell-Try-to-follow-

Here's symbolic differentiation done in ~20 lines of Haskell: https://www.quora.com/What-are-20-lines-of-code-that-capture-the-essence-of-Haskell-Try-to-follow-standard-Haskell-style-Comments-and-spaces-between-code-do-not-count-as-lines-They-can-also-consist-of-individual-snippets-of-code-but-have-to-add-up-to-20-lines https://www.quora.com/What-are-20-lines-of-code-that-capture...