Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the strength of some topological lattices   We study the model theoretic strength of various lattices that occur
naturally in topology, like closed (semi-linear or semi-algebraic or convex)
sets. The method is based on weak monadic second order logic and sharpens
previous results by Grzegorczyk. We also answers a question of Grzegorczyk on
the 'algebra of convex sets'.

36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph