Quantum-field-theory definitions

The application of quantum mechanics to physical systems described by fields, such as electromagnetic fields, developed to make quantum mechanics both consistent with the theory of special relativity and more readily applicable to systems involving many particles or the creation and destruction of particles.
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The application of quantum mechanics to physical systems described by fields, such as electromagnetic fields. Quantum field theory was developed to overcome certain deficiencies in Schrödinger's equation , in particular the fact that it was not consistent with special relativity and was difficult to apply to systems involving many particles or to the creation and destruction of particles.
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