Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-formal co-symplectic manifolds   We study the formality of the mapping torus of an orientation-preserving
diffeomorphism of a manifold. In particular, we give conditions under which a
mapping torus has a non-zero Massey product. As an application we prove that
there are non-formal compact co-symplectic manifolds of dimension $m$ and with
first Betti number $b$ if and only if $m=3$ and $b \geq 2$, or $m \geq 5$ and
$b \geq 1$. Explicit examples for each one of these cases are given.

32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph