  We study a minisuperspace quantum cosmology for a 2+1 dimensional de Sitter
universe and find the wave function both exactly and in WKB approximation. Then
we extend the model to a canonically quantized field theory for quantum
gravity, i.e., a midisuperspace, and obtain the wave functional of the
resulting field theory in the saddle point approximation. It is shown that
these two approaches yield different results.
