Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discrete piecewise linear functions   The concept of permutograph is introduced and properties of integral
functions on permutographs are established. The central result characterizes
the class of integral functions that are representable as lattice polynomials.
This result is used to establish lattice polynomial representations of
piecewise linear functions on convex domains and continuous selectors on linear
orders.

32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an