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In mathematical physics, constructive quantum field theory is the field whose objective is to establish existence theorems for models of quantum field theory. (Def: http://en.m.wikipedia.org/wiki/Constructive_quantum_field_theory)

In mathematical physics, constructive quantum field theory is the field whose objective is to establish existence theorems for models of quantum field theory. Reference: Wikipedia.

Such theorems were proved in the 1960s and 1970s for quantum field theory models in two and three dimensional space-times in the papers by James Glimm, Arthur Jaffe, Irving Segal, Edward Nelson, and others.

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