2 problems

Let $D70E_n$ be a uniformly random permutation in the symmetric group $D70E_n$, and let $D43E\operatorname{Pop}$ denote one step of Pop-Stack Sorting, which reverses every maximal…

Wastlund's conjecture. If $n\neq 13$ and $n\neq 15$, then every $n$-permutation can be sorted by at most