  Canonical quantization of general relativity does not yield a unique quantum
theory for gravity. This is in part due to operator ordering ambiguities. In
this paper, we investigate the role of different operator orderings on the
question of whether a big bang or big crunch singularity occurs. We do this in
the context of the minisuperspace model of a
Friedmann-Lemaitre-Robertson-Walker universe with Brown-Kuchar dust. We find
that for a certain class of operator orderings such a singularity is eliminated
without having to impose boundary conditions.
