Constructive quantum field theory (CQFT) is a branch of theoretical physics that aims to provide rigorous mathematical foundations to quantum field theory (QFT). Traditional approaches to QFT often involve perturbative techniques and heuristic arguments, which can sometimes lead to ambiguities or inconsistencies. In contrast, CQFT seeks to establish a solid mathematical framework for QFT by developing and rigorously proving results using techniques from advanced mathematics, such as operator algebras, functional analysis, and topology.
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