# ANNALES DE L'INSTITUT FOURIER

[Unitarizable highest weight modules over the twisted sector of the $N=2$ super Virasoro algebra]

[On piecewise class $P$ ${C}^{r}$ homeomorphisms of the circle which are piecewise ${C}^{r}$ $\left(r\ge 1\right)$ conjugate to irrational rotations]

[A variant of the isoperimetric method of Hamidoune, applied to Kneser’s theorem]