Abstract
A simple derivation of BRS cohomology is described in terms of Abelian string operators, which naturally form a Kugo-Ojima quartet. This formalism gives explicit realisations of both the physical and unphysical subspaces. The construction of the Abelian string operators is based on a geometrical understanding of the vertex operator in terms of generalised vielbeins defining the passage between Abelian and non-Abelian quantities for infinite-dimensional constraint algebras.
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