Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Euclidean formulation of relativistic quantum mechanics   We discuss preliminary work on a formulation of relativistic quantum
mechanics that uses reflection-positive Euclidean Green functions or their
generating functionals as phenomenological input. We discuss the construction
of a Poincare invariant S-matrix from matrix element of exp(- \beta H).

29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas