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Jun 5, 2022 at 5:02 vote accept AMath91
Jun 4, 2022 at 4:59 answer added Hercule Poirot timeline score: 1
Jul 5, 2021 at 20:24 comment added Stefan Witzel How about: take an apartment that contains $x$ and $\xi$ and then argue that the stabilizer acts sufficiently transitively to move that apartment into one that contains $\Delta_x$? If the building is a non-discrete version of Moufang, this should work.
Jul 3, 2021 at 6:46 history edited HJRW
Add arXiv tag.
Jul 2, 2021 at 15:31 history edited AMath91 CC BY-SA 4.0
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Jul 2, 2021 at 15:17 comment added Stefan Witzel I think you cannot ask for the apartment to contain $y$, only the germ $\Delta_x$: in a tree take a tripod with outer vertices $x$, $y$, $z$ suppose the ray from $x$ to $\xi$ passes through $z$. Then there is no apartment containing $x$, $y$, and $\xi$.
Jul 2, 2021 at 15:11 history asked AMath91 CC BY-SA 4.0