3 problems

Sharp $L^p$ boundedness conjecture. The $L^p$ boundedness of $M_{\gamma_n}$ holds if and only if $p>n$.

Maximal-operator conjecture. The operator $M_\gamma$ maps $L^p(\mathbb R^n)$ to $L^p(\mathbb R^n)$ boundedly if and only if $p>n$. This conjecture concerns the $L^p$ theory of geom…

Local smoothing conjecture. The displayed inequality holds for all $\sigma < \sigma(p,n)$. This conjecture is solved affirmatively for $n=2$; for $n \geq 3$, it is known when…