Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A geometric model of an arbitrary differentially closed field of
  characteristic zero   We give an elementary construction of an arbitrary differentially closed
field and of a universal differential extension of a differential field in
terms of Nash function fields. We also give a characterization of any
Archimedean ordered differentially closed field in terms of Nash functions.

33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg