Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An involution acting nontrivially on Heegard-Floer homology   We show that a certain involution on the well known homology sphere (the
boundary of the Mazur manifold) induces a nontrivial homomorphism on its
Heegard-Floer homology groups (recently defined by Ozsvath and Szabo). We
discuss a possible application of this to constructing exotic smooth structures
on 4-manifolds.

27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th