  We obtain an exact formula for the Fourier transform of multiradial
functions, i.e., functions of the form $\Phi(x)=\phi(|x_1|, \dots, |x_m|)$,
$x_i\in \mathbf R^{n_i}$, in terms of the Fourier transform of the function
$\phi$ on $\mathbf R^{r_1}\times \cdots \times \mathbf R^{r_m}$, where $r_i$ is
either 1 or 2.

Classical Analysis and ODEs