Special Relativity: Relativistic Mechanics

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Action for a free particle, Lagrangian, canonical momentum and Euler-Lagrange equation, energy and rest energy, the relation between energy and momentum, motivation for a covariant derivation, covariant variation of the action for a free particle, dependence of action on the end point, 4-momentum vector, threshold for a proton-antiproton pair production.

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At 16:00 I do not understand how you got the expression for delta(ds)

mohtasimtamjeed
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Great, if you can speak up a bit it will be perfect

kitoliao