Is property FA of Serre known for $SL_2(\mathbb{Z}[i])$ and $SL_2(\mathbb{Z}[\zeta_3])$
Posted by Adrián González Pérez, at mathoverflow.net,
In Serre's book Trees [Se, p. 68] it says: 3) For $SL_2$ the situation is different. It is clear…
In Serre's book Trees [Se, p. 68] it says: 3) For $SL_2$ the situation is different. It is clear…
Background: Katherine Stange describes Schmidt arrangements in "Visualising the arithmetic of imaginary quadratic fields", arXiv…