Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: From Hypercomplex to Holomorphic Symplectic Structures   The notions of holomorphic symplectic structures and hypercomplex structures
on Courant algebroids are introduced and then proved to be equivalent. These
generalize hypercomplex triples and holomorphic symplectic 2-forms on manifolds
respectively. Basic properties of such structures are established.

12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int