“…In fact, it is possible to circumvent the ill defined singular products 0 · δ(0) stemming from the non-normalisable character of thep λ eigenstates in still another manner, that also explicitly preserves manifest BRST invariance at all stages and does not require to considerÛ BRST (t 2 , t 1 ) matrix elements for non-BRST invariant external states, and still reach exactly the identical conclusion. 19 Any gauge fixing leads to a dynamics defined over the space of gauge orbits of the system, hence to a gauge invariant dynamics, but which of these gauge orbits are included and with which multiplicity is dependent on the choice of gauge fixing procedure. The correct physics and dynamics is represented only for an admissible gauge fixing procedure, namely one which selects, up to a common weight factor, once and only once each of the gauge orbits and thus induces an admissible covering of the space of gauge orbits.…”