Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discrete spectral symmetries of low-dimensional differential operators
  and difference operators on regular lattices and two-dimensional manifolds   Euler-Darboux-Backlund and Laplace transformations are considered for the
one- and two-dimensional Schrodinger operators. Their discrete analogs are
constructed and generalized for the multidimensional lattices and two-manifolds
with special "black-white" triangulations. Nonstandard generalizations of the
connections and curvature are constructed for the simplicial complexes. Exactly
solvable 2D Schrodinger operators with nonstandard spectral properties are
constructed in the continuous and discrete cases using Laplace chains with
different restrictions.

36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol