Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatial pseudoanalytic functions arising from the factorization of
  linear second order elliptic operators   Biquaternionic Vekua-type equations arising from the factorization of linear
second order elliptic operators are studied. Some concepts from classical
pseudoanalytic function theory are generalized onto the considered spatial
case. The derivative and antiderivative of a spatial pseudoanalytic function
are introduced and their applications to the second order elliptic equations
are considered.

10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys