11.07.2015 Views

International Congress of Mathematicians

International Congress of Mathematicians

International Congress of Mathematicians

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Algebraic ÜT-theory and Trace Invariants 419that the residue field k be separably closed is not essential. In the general case, oneinstead has a short-exact sequence0 -+ (W. 0^M) ® Mp.) F=1 -+ K(K)/p* -+ (W. 0^M) /p") F=1 -+ 0,where the superscript (resp. subscript) "F = 1" indicates Frobenius invariants(resp. coinvariants).We discuss a global version <strong>of</strong> theorem 2.1. Let V u be a henselian discretevaluation ring with quotient field K 0 <strong>of</strong> characteristic zero and perfect residue fieldfco <strong>of</strong> odd characteristic p. Let X be a smooth Vp-scheme, and let i (resp. j) denotethe inclusion <strong>of</strong> the special (resp. generic) fiber as in the cartesian diagramX" >X< -Spec K 0c/> Spec V u

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