 BRST quantization is a differential geometric approach to performing consistent, anomaly-free perturbative calculations in a non-abelian gauge theory.The analytical form of the BRST "transformation" and its relevance to renormalization and anomaly cancellation were described by Carlo Maria Becchi, , and Raymond Stora in a series of papers culminating in the 1976 "Renormalization of gauge theories".The equivalent transformation and many of its properties were independently discovered by Igor Viktorovich Tyutin.