Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transformations of Grassman Spaces   This is a version of a part of the book ``Transformations of Grassman
Spaces'' (in progress). We study transformations of Grassman spaces preserving
certain geometrical constructions related to buildings. The next part will be
devoted to Grassman spaces associated with polar spaces.

33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
1
The categories of this paper are: cs