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1934
Fock functionals
Fock develops a method for describing a system with an indeterminate
number of particles by means of a generating functional, a method now
known as the method of Fock functionals. The first application (in
quantum electrodynamics) of the apparatus of variational
differentiation.
V. Fock, "Zur Quantenelektrodynamik," Phys. Zeits. Sowjetunion 6
(1934): 425-469.
--Karl Hall
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