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General structure of BRST-invariant constraint algebra is established, in itscommutator and antibracket forms, by means of formulation of algebra-generatingequations in yet more extended phase space. New ghost-type variables behave asfields and antifields with respect to quantum antibrackets. Explicit form ofBRST-invariant gauge algebra is given in detail for rank-one theories withWeyl- and Wick- ordered ghost sector. A gauge-fixed unitarizing Hamiltonian isconstructed, and the formalism is shown to be physically equivalent to thestandard BRST-BFV approach.Comment: 20 pages; some misprints are remove

BRST-Invariant Algebra of Constraints in Terms of Commutators and Quantum Antibrackets