Article https://golem.ph.utexas.edu/category/2009/08/feynman_the_babylonian.html - has several definitions for the derivative. Survey through the most intuitive to the most technical.
Article https://golem.ph.utexas.edu/category/2009/08/feynman_the_babylonian.html - has several definitions for the derivative. Survey through the most intuitive to the most technical.