作者：Arne Smeets 来源：[J].Algebra & Number Theory(IF 0.625), 2017, Vol.11 (1), pp.213-233 摘要：Let R be a strictly local ring complete for a discrete valuation, with fraction field K and residue field of characteristic p > 0 . Let X be a smooth, proper variety over K . Nicaise conjectured that the rational volume of X is equal to the trace of the tame monodromy operat...
 作者：Ben Davison , Sven Meinhardt 来源：[J].Algebra & Number Theory(IF 0.625), 2017, Vol.11 (6), pp.1243-1286 摘要：We calculate the motivic Donaldson–Thomas invariants for ( − 2 ) -curves arising from 3 -fold flopping contractions in the minimal model program. We translate this geometric situation into the machinery developed by Kontsevich and Soibelman, and using the results and framewo...
 作者：David Krumm 来源：[J].Algebra & Number Theory(IF 0.625), 2019, Vol.13 (4), pp.963-993 摘要：Let t and x be indeterminates, let ϕ ( x ) = x 2 + t ∈ ℚ ( t ) [ x ] , and for every positive integer n let Φ n ( t , x ) denote the n -th dynatomic polynomial of ϕ . Let G n be the Galois group of Φ n over the function field ℚ ( t ) , and for c ∈ ℚ let G n , c be ...
 作者：Shulim Kaliman 来源：[J].Algebra & Number Theory(IF 0.625), 2018, Vol.12 (2), pp.227-258 摘要：We prove that the actions mentioned in the title are translations. We show also that for certain G a -actions on affine fourfolds the categorical quotient of the action is automatically an affine algebraic variety and describe the geometric structure of such quotients.
 作者：Koji Shimizu 来源：[J].Algebra & Number Theory(IF 0.625), 2017, Vol.11 (1), pp.181-211 摘要：Deligne conjectured that a single ℓ -adic lisse sheaf on a normal variety over a finite field can be embedded into a compatible system of ℓ ′ -adic lisse sheaves with various ℓ ′ . Drinfeld used Lafforgue’s result as an input and proved this conjecture when the var...
 作者：Yohsuke Matsuzawa , Kaoru Sano , Takahiro Shibata 来源：[J].Algebra & Number Theory(IF 0.625), 2018, Vol.12 (7), pp.1635-1657 摘要：For a dominant rational self-map on a smooth projective variety defined over a number field, Kawaguchi and Silverman conjectured that the (first) dynamical degree is equal to the arithmetic degree at a rational point whose forward orbit is well-defined and Zariski dense. We prove...
 作者：Aldo Conca , Volkmar Welker 来源：[J].Algebra & Number Theory(IF 0.625), 2019, Vol.13 (2), pp.455-484 摘要：Motivated by questions in algebra and combinatorics we study two ideals associated to a simple graph G :(#br) the Lovász-Saks-Schrijver ideal defining the d -dimensionalorthogonal representations of the graph complementary to G ,and the determinantal ideal of the ( d + 1 ) -...
 作者：Andrew Sutherland , David Zywina 来源：[J].Algebra & Number Theory(IF 0.625), 2017, Vol.11 (5), pp.1199-1229 摘要：For each open subgroup G of GL 2 ( ℤ ̂ ) containing − I with full determinant, let X G ∕ ℚ denote the modular curve that loosely parametrizes elliptic curves whose Galois representation, which arises from the Galois action on its torsion points, has image conta...
 作者：Hiroki Matsui , Ryo Takahashi 来源：[J].Algebra & Number Theory(IF 0.625), 2017, Vol.11 (7), pp.1677-1738 摘要：Let R be a commutative noetherian ring. Denote by D − ( R ) the derived category of cochain complexes X of finitely generated R -modules with H i ( X ) = 0 for i ≫ 0 . Then D − ( R ) has the structure of a tensor triangulated category with tensor product ⋅ ⊗ R L ⋅ ...
 作者：Brendan Creutz , Bianca Viray 来源：[J].Algebra & Number Theory(IF 0.625), 2018, Vol.12 (10), pp.2445-2470 摘要：Let X ⊂ ℙ k n be a smooth projective variety of degree d over a number field k and suppose that X is a counterexample to the Hasse principle explained by the Brauer–Manin obstruction. We consider the question of whether the obstruction is given by the d -primary subgrou...