Results 31 to 40 of about 63,567 (182)

A note on h 2,1 of divisors in CY fourfolds. Part I

Journal of High Energy Physics, 2022
In this note, we prove combinatorial formulas for the Hodge number h 2,1 of prime toric divisors in an arbitrary toric hypersurface Calabi-Yau fourfold Y 4.
Manki Kim
doaj   +1 more source

A Geometric characterization of Arithmetic Varieties [PDF]

, 2002
A result of Belyi can be stated as follows. Every curve defined over a number field can be expressed as a cover of the projective line with branch locus contained in a rigid divisor.
Paranjape, Kapil Hari
core   +2 more sources

New free divisors from old

, 2012
We present several methods to construct or identify families of free divisors such as those annihilated by many Euler vector fields, including binomial free divisors, or divisors with triangular discriminant matrix.
Buchweitz, Ragnar-Olaf, Conca, Aldo
core   +1 more source

Smooth Gevrey normal forms of vector fields near a fixed point [PDF]

, 2013
We study germs of smooth vector fields in a neighborhood of a fixed point having an hyperbolic linear part at this point. It is well known that the "small divisors" are invisible either for the smooth linearization or normal form problem.
Stolovitch, Laurent
core   +4 more sources

On the Tate Conjectures for Divisors on a Fibred Variety and on its Generic Scheme Fibre in the Case of Finite Characteristic

Моделирование и анализ информационных систем, 2017
We investigate interrelations between the Tate conjecture for divisors on a fibred variety over a finite field and the Tate conjecture for divisors on the generic scheme fibre under the condition that the generic scheme fibre has zero irregularity. Let \(
Tatyana V. Prokhorova
doaj   +1 more source

Extremal divisors on moduli spaces of rational curves with marked points [PDF]

, 2016
We study effective divisors on $\overline{M}_{0,n}$, focusing on hypertree divisors introduced by Castravet and Tevelev and the proper transforms of divisors on $\overline{M}_{1,n-2}$ introduced by Chen and Coskun. Results include a database of hypertree
Opie, Morgan
core   +1 more source

Inequalities between some arithmetic functions, II [PDF]

Notes on Number Theory and Discrete Mathematics
As a continuation of Part I (see [1]), we offer new inequalities for classical arithmetic functions such as the Euler's totient function, the Dedekind's psi function, the sum of the positive divisors function, the number of divisors function, extended ...
Krassimir Atanassov, József Sándor, Mladen Vassilev-Missana   +2 more
doaj   +1 more source

On Degrees of Modular Common Divisors and the Big Prime gcd Algorithm

International Journal of Mathematics and Mathematical Sciences, 2016
We consider a few modifications of the Big prime modular gcd algorithm for polynomials in Z[x]. Our modifications are based on bounds of degrees of modular common divisors of polynomials, on estimates of the number of prime divisors of a resultant, and ...
Vahagn Mikaelian
doaj   +1 more source

Ample Weil divisors

Journal of Algebra, 2015
Version 3: published ...
Alberto Chiecchio, Stefano Urbinati
openaire   +5 more sources

Finite completely primary rings in which the product of any two zero divisors of a ring is in its coefficient subring

International Journal of Mathematics and Mathematical Sciences, 1994
According to general terminology, a ring R is completely primary if its set of zero divisors J forms an ideal. Let R be a finite completely primary ring. It is easy to establish that J is the unique maximal ideal of R and R has a coefficient subring S (i.
Yousif Alkhamees
doaj   +1 more source