Download e-book for iPad: Algebraic cycles and motives by Jan Nagel, Chris Peters

By Jan Nagel, Chris Peters

ISBN-10: 0521701740

ISBN-13: 9780521701747

ISBN-10: 0521701759

ISBN-13: 9780521701754

Algebraic geometry is a vital subfield of arithmetic within which the research of cycles is a crucial subject matter. Alexander Grothendieck taught that algebraic cycles could be thought of from a motivic standpoint and in recent times this subject has spurred loads of job. This publication is one in all volumes that supply a self-contained account of the topic because it stands this present day. jointly, the 2 books comprise twenty-two contributions from prime figures within the box which survey the major learn strands and current fascinating new effects. issues mentioned comprise: the research of algebraic cycles utilizing Abel-Jacobi/regulator maps and common services; factors (Voevodsky's triangulated type of combined reasons, finite-dimensional motives); the conjectures of Bloch-Beilinson and Murre on filtrations on Chow teams and Bloch's conjecture. Researchers and scholars in complicated algebraic geometry and mathematics geometry will locate a lot of curiosity right here.

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Example text

54 J. Ayoub Proof One may assume that A is the motive of a smooth S-scheme f : / S . Then we see that U hom(A, B(−N )[∗]) = hom(ZU , f ∗ B(−N )[∗]) = hom(Z, (πU )∗ f ∗ B(−N )[∗]) with πU the projection of U to k. Thus it suffices to consider the case where A = Z and B ∈ DMct (k). Denoting D = Hom(−, Z) the duality operator, we have: hom(Z, B(−N )[∗]) = hom(D(B), Z(−N )[∗]). We finally see that it suffices to prove that for a smooth variety V over k we have hom(V, Z(−N )[∗]) = 0 for N large enough.

7. Suppose that k is of infinite transcendence degree over Q. To show that every constructible object of DMQ (k) is Schur finite, it suffices to check that for any n ∈ N, and any general† smooth hypersurface H of Pn+1 , the motive M (H) is Schur finite. 7. We work under the assumption that the motive M (H) is Schur finite whenever H is a general smooth hypersurface of some Prk . Remark that if k is another field and H is a general hypersurface of Prk then the motive M (H ) is Schur finite in DMQ (k ).

First remark that (cA≤1 ) maps naturally to the motivic Kummer torsor. Indeed, we take the morphism induced by the morphisms of complexes cA≤1 [id : Gm → Gm] K [id : Gm → Gm] ∆−(x,1) θ / [pr1 : Gm × Gm → Gm]  / [pr1 : Gm × (Gm, 1) → Gm] where the two horizontal arrows are the first and only non-zero differentials of cA≤1 and K. This canonical morphism will be denoted by γ1 . By com/ (cA≤1 ) we get for n ≥ 1 posing with the obvious morphisms (cA≤n ) canonical morphisms γ1 : (cA≤n ) / K. Passing to the symmetric powers, we get morphisms γr : Symr (cA≤n ) / Log r .

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Algebraic cycles and motives by Jan Nagel, Chris Peters


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