Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Gravity and Regge Calculus   This is an informal review of the formulation of canonical general relativity
and of its implications for quantum gravity; the various versions are compared,
both in the continuum and in a discretized approximation suggested by Regge
calculus. I also show that the weakness of the link with the geometric content
of the theory gives rise to what I think is a serious flaw in the claimed
derivation of a discrete structure for space at the quantum level.

1
The categories of this paper are: cs
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th