Journal of Algebra Fundamental Domains for Congruence Subgroups of Sl 2 in Positive Characteristic
نویسندگان
چکیده
Article history: Received 28 May 2010 Available online 5 November 2010 Communicated by Gerhard Hiss MSC: primary 20E08, 05C25, 20-04 secondary 20F32
منابع مشابه
Fundamental Domains for Congruence Subgroups of Sl2 in Positive Characteristic
Morgenstern ([Mor95]) claimed to have constructed fundamental domains for congruence subgroups of the lattice group Γ = PGL2(Fq[t]), and subgraphs providing the first known examples of linear families of bounded concentrators. His method was to construct the fundamental domain for a congruence subgroup as a ‘ramified covering’ of the fundamental domain for Γ on the Bruhat-Tits tree X = Xq+1 of ...
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