Un anneau de deformation universel en conducteur superieur (A universal deformation ring in higher conductor)

Details Un anneau de deformation universel en conducteur superieur (A universal deformation ring in higher conductor) Un anneau de deformation universel en conducteur superieur (A universal deformation ring in higher conductor)

2009-10-14

arxiv.org/abs/0910.2557v1

Mathematics

Number Theory

4 pages, in French

Scientific paper

Let k denote a perfect field of characteristic 5. We show that the versal
deformation ring of an element of order 5 and Hasse conductor 2 as automorphism
of a ring of formal power series k[[t]] computed by Bertin and Mezard, is in
fact universal. This provides the first example of a non trivial universal
deformation ring in higher conductor.

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