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Functions of bounded variation, signed measures, and a general Koksma-Hlawka inequality

Christoph Aistleitner, Josef Dick (2015)

Acta Arithmetica

We prove a correspondence principle between multivariate functions of bounded variation in the sense of Hardy and Krause and signed measures of finite total variation, which allows us to obtain a simple proof of a generalized Koksma-Hlawka inequality for non-uniform measures. Applications of this inequality to importance sampling in Quasi-Monte Carlo integration and tractability theory are given. We also discuss the problem of transforming a low-discrepancy sequence with respect to the uniform measure...

Functoriality and the Inverse Galois problem II: groups of type B n and G 2

Chandrashekhar Khare, Michael Larsen, Gordan Savin (2010)

Annales de la faculté des sciences de Toulouse Mathématiques

This paper contains an application of Langlands’ functoriality principle to the following classical problem: which finite groups, in particular which simple groups appear as Galois groups over ? Let be a prime and t a positive integer. We show that that the finite simple groups of Lie type B n ( k ) = 3 D S O 2 n + 1 ( 𝔽 k ) d e r if 3 , 5 ( mod 8 ) and G 2 ( k ) appear as Galois groups over , for some k divisible by t . In particular, for each of the two Lie types and fixed we construct infinitely many Galois groups but we do not have a precise control...

Fundamental domains for Shimura curves

David R. Kohel, Helena A. Verrill (2003)

Journal de théorie des nombres de Bordeaux

We describe a process for defining and computing a fundamental domain in the upper half plane of a Shimura curve X 0 D ( N ) associated with an order in a quaternion algebra A / 𝐐 . A fundamental domain for X 0 D ( N ) realizes a finite presentation of the quaternion unit group, modulo units of its center. We give explicit examples of domains for the curves X 0 6 ( 1 ) , X 0 15 ( 1 ) , and X 0 35 ( 1 ) . The first example is a classical example of a triangle group and the second is a corrected version of that appearing in the book of Vignéras [13], due to Michon....

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