Is this man a charlatan and is this book nonsense? I can’t tell yet and don’t like to waste time.pic.twitter.com/ArTSZHwjUW
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Nooo script L's are only for Lagrangian densities (to distract people from the fact that path integrals are mathematically dodgy)
When teaching rigid body mechanics, the fact that L is both the Lagrangian and the angular momentum is always a source of headaches 
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