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What is wrong with $A^{(2)}_{2n}$?

I suspect that this last point 4) is the most important point, but since I'm not an expert on buildings or Bruhat-Tits theory, I would appreciate an understanding of why this feature of the Dynkin diagram …
Marc Besson's user avatar
3 votes
0 answers
329 views

Tits Reductive Groups over Local Fields Example 1.15 (Quasi-split special unitary groups in ...

I hope this question about Tits's paper "Reductive groups over local fields" in Algebraic groups and discontinuous subgroups ends up having an easy answer, but I'm a little stuck on the morass of nota …
Marc Besson's user avatar