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Название: Principles of Quantum Mechanics, The
Автор: Dirac P.
The main change from the third edition is that the chapter on quantum electrodynamics has been rewritten. The quantum electrodynamics
given in the third edition describes the motion of individual charged
particles moving through the electromagnetic field, in close analogy
with classical electrodynamics. It is a form of theory in which the
number of charged particles is conserved and it cannot be generalized
to allow of variation of the number of charged particles.