Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proving UNSAT in SMT: The Case of Quantifier Free Non-Linear Real
  Arithmetic   We discuss the topic of unsatisfiability proofs in SMT, particularly with
reference to quantifier free non-linear real arithmetic. We outline how the
methods here do not admit trivial proofs and how past formalisation attempts
are not sufficient. We note that the new breed of local search based algorithms
for this domain may offer an easier path forward.

23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph