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math.AG2014
Severi's theorem for d-uple Veronese varieties
Jeroen Schillewaert, Koen Struyve
We characterize -uple Veronese embeddings of finite-dimensional projective spaces. The easiest non-trivial instance of our theorem is the embedding of the projective plane in 5-…
math.GR2014
Quotients of trees for arithmetic subgroups of PGL2 over a rational function field
Ralf Köhl, Bernhard Mühlherr, Koen Struyve
In this note we compute the fundamental domain of the action on the corresponding Bruhat-Tits tree of the arithmetic subgroup of PGL2 with respect to an arbitrary place of the rati…