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A joint introduction of composite and background fields into non-Abelian quantum gauge theories is suggested based on the symmetries of the generating functional of Green's functions, with the systematic analysis focused on quantum Yang–Mills theories, including the properties of the generating functional of vertex Green's functions (effective action). For the effective action in such theories, gauge dependence is found in terms of a nilpotent operator with composite and background fields, anddoi:10.3390/sym12121985 fatcat:3cvisbzrszgmlky75y7jmcgljy