Abstract
A formal proof and explicit check of unitarity for non-Abelian gauge theories with a particular bilinear gauge condition are presented. The theories are constructed within the Lagrange-multiplier formalism. It is concluded that the usual formalism for non-Abelian gauge theories is not completely satisfied because it leads to violation of unitarity when one uses the Wu-gauge condition. The Lagrange-multiplier formalism can reveal the stability of gauge conditions, if any, and has more general validity than the usual formalism. (JFP)
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