Maps related to polar spaces preserving a Weyl distance or an incidence condition

A. De Schepper, H. Van Maldeghem

Let ${\Omega }_i$ and ${\Omega }_j$ be the sets of elements of respective types $i$ and $j$ of a polar space~$\Delta$ of rank at least $3$, viewed as a Tits-building. For any Weyl distance $\delta$ between…