Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological properties of punctual Hilbert schemes of almost-complex
  fourfolds (I)   In this article, we study topological properties of Voisin's punctual Hilbert
schemes of an almost-complex fourfold $X$. In this setting, we compute their
Betti numbers and construct Nakajima operators. We also define tautological
bundles associated with any complex bundle on $X$, which are shown to be
canonical in $K$-theory.

4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th