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The evolution of ideas which has led from the first proofs of the renormalizability of non-Abelian gauge theories, based on Slavnov–Taylor identities, to the modern proof based on the BRS symmetry and the master equation is recalled. This lecture has been delivered at the Symposium in Honour of Professor C. N. Yang, Stony Brook, May 21, 22, 1999.
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Jean Zinn‐Justin (1999) studied this question.
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