• Title: Ramification groups of a local field (with Ahmed Abbes and Kazuya Kato)
    Speaker: Takeshi Saito (齋藤毅 東京大學)
    Time: 2019-9-5, 10:00—11:30
    Place: N202
    Abstract: For a Galois extension of a discrete valuation field with not necessarily perfect residue field, two filtrations (logarithmic and non-logarithmic) by ramification groups are defined by a geometric method by Abbes and myself. For an abelian extension, another filtration is defined earlier by Kato by a cohomological method. After briefly recalling the definition, we discuss a recent result with Kato on the equality of Kato's filtration with the logarithmic filtration.
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