2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/209203In this article, let $Σ\subset\R^{2n}$ be a compact convex hypersurface which is $(r, R)$-pinched with $\frac{R}{r}<\sqrt{3/2}$. Then $\Sg$ carries at least two strictly elliptic closed characteristics; moreover, $\Sg$ carries at least $2[\frac{n+2}{4}]$ non-hyperbolic closed characteristics.18 pagesSymplectic Geometry58E05, 37J45, 37C75text