Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some Considerations on Universality   The paper puts into discussion the concept of universality, in particular for
structures not of the power of Turing computability. The question arises if for
such structures a universal structure of the same kind exists or not. For that
the construction of universal Turing machines and those with some constraints
are presented in some detail.

31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an