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BRST Quantization
In theoretical physics, BRST Quantization is a relatively rigorous mathematical approach to quantizing a field theory with a gauge symmetry. Quantization rules in earlier QFT frameworks resembled "prescriptions" or "heuristics" more than proofs, especially in non-abelian QFT, where the use of "ghost" fields with superficially bizarre properties is almost unavoidable for technical reasons related to renormalization and anomaly cancellation.
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