Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intransitive geometries   A lemma of Tits establishes a connection between the simple connectivity of
an incidence geometry and the universal completion of an amalgam induced by a
sufficiently transitive group of automorphisms of that geometry. In the present
paper, we generalize this lemma to intransitive geometries, thus opening the
door for numerous applications. We treat ourselves some amalgams related to
intransitive actions of finite orthogonal groups, as a first class of examples.

8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess