The original question was: I was wondering quite how much of physics (mainly regarding classical mechanics but all branches!) can be deduced from previous equations/axioms. Most of the big advancements in physics come from discovering the new, and absolutely not derivable, axioms of the universe. Although most physicists would probably agree that there are plenty, I’ve never heard of anyone actually attempting to count the number of fundamental laws that are out there. Trying to count the fundamental laws seems like a good way to goad physicists into a fist fight.