  In this note, we discuss a question posed by T. Hoffmann-Ostenhof concerning
the parity of the number of nodal domains for a non-constant eigenfunction of
the Laplacian on flat tori. We present two results. We first show that on the
torus $(\mathbb{R}/2\pi\mathbb{Z})^{2}$, a non-constant eigenfunction has an
even number of nodal domains. We then consider the torus
$(\mathbb{R}/2\pi\mathbb{Z})\times(\mathbb{R}/2\rho\pi\mathbb{Z})\,$, with
$\rho=\frac{1}{\sqrt{3}}\,$, and construct on it an eigenfunction with three
nodal domains.

Analysis of PDEs;Spectral Theory