Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Riemannian geometry as a reason of the third modification of the
  space-time geometry   The third modification of the space-time geometry is considered. (The first
modification is the spacial relativity, the second one is the general
relativity.) After the third modification of the space-time geometry the motion
of free particles become to be primordially stochastic (multivariant). This
circumstance forces one to construct a multivariant dynamics. The multivariant
dynamics is the classical dynamics in the non-Riemannian space-time geometry.
The multivariant dynamics explains quantum effects without a reference to the
quantum principles. Elimination of quantum principles admits one to solve the
main problem of relativistic quantum theory: unification of the principles of
relativity with the nonrelativistic quantum principles.

28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg