In QFT, Lagrangian is often mentioned. While in QM, it's the Hamiltonian, Is the direct answer because in QFT "position" of particle is focused on and Lagrangian is mostly about position and coordinate while in QM, potential is mostly focus on and Hamiltonian is mostly about potential and coordinate?(adsbygoogle = window.adsbygoogle || []).push({});

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# Lagrangian vs Hamiltonian in QFT vs QM

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