9.3. Duality Show that the Dirac equation (9.7.12) with m > 0 is linked by a unitary

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9.3. Duality Show that the Dirac equation (9.7.12) with m > 0 is linked by a unitary transformation to the one m < 0. The map between the two Hamiltonians establishes the duality relation of the Ising model in its fermionic formulation.

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