Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conformal numbers   The conformal compactification is considered in a hierarchy of hypercomplex
projective spaces with relevance in physics including Minkowski and Anti-de
Sitter space. The geometries are expressed in terms of bicomplex Vahlen
matrices and further broken down into their structural components. The relation
between two subsequent projective spaces is displayed in terms of the complex
unit and three additional hypercomplex numbers.

31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ