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    Lagrangian of a free particle

    Hello, I'm trying to follow an argument in Landau's Mechanics. The argument concerns finding the Lagrangian of a free particle moving with velocity v relative to an inertial frame K. (of course L=1/2 mv^2, which is what we have to find). I'll state the points of the argument: (0) It has...
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    Programs Physics advice for math phd student

    Hi, I'm completing my phd in mathematics (number theory) within a year or so. I'm not sure I want to pursue academia and would like to work in the industry first. I'm interested in pursuing physics, electronics, and building things :) and was curious about working in a physics related job...