Abstract
A canonical system with first-class constraints admits a Parisi-Sourlas type Osp(2|2) in variance for each of its constraints and the standard BRST and anti-BRST operators are generators in a direct sum representation of the Osp(2|2) Lie algebra. This direct sum representation has two additional nilpotent anticommuting generators which are on an equal footing with the standard BRST operators, and any one of these four operators could be used as the BRST operator of the theory.
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