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Hope all is well. I'm trying to get my head round some of the Quantum Mechanics of spin. I fully understand why the Pauli equation acts on a two component spinor wavefunction, where i'm a little confused is why the Dirac equation then acts on a 4 component spinor wavefunction. I get that it is in a sense four coupled equations but why is spin implied? I've done a fair bit of reading in the griffiths book but any extra insight would be very much appreciated.

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# I Spinors in Quantum Mechanics

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