Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On atomicity of free algebras in Boolean algebras with operators, and a
  new result on Pinter's free algebras   We give some general theorems on free algebras of varieties of Boolean
algebras with operators; a hitherto new result is obtained for Pinter's
substitution algebras. For n\geq 3, and m>1, there is a generating set of the
free algebra freely generated by m elements, which is not a free set of
generators.

7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th