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Show that the representation of the state of a free particle in Dirac formalism as a 4 x 1 column matrix have an inbuilt

Show that the representation of the state of a free particle in Dirac formalism as a 4 x 1 column matrix have an inbuilt redundancy. Using the Foldy-Wouthuysen transformation remove this redundancy in the Dirac Hamiltonian given below: A = cd P+ Bm,c

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