Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geometrical modification of quaternionic quantum mechanics   We present an axiomatic modification of quaternionic quantum mechanics with a
possible-worlds semantics capable of predicting essential "nonquantum" features
of an observable universe model - the dimensionality and topology of spacetime,
the existence, the signature and a specific form of a metric on it, and certain
naturally distinguished directions (vistas) in spacetime unrelated to its
metric properties.

28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci