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Continued fractions on the Heisenberg group

Anton Lukyanenko, Joseph Vandehey (2015)

Acta Arithmetica

We provide a generalization of continued fractions to the Heisenberg group. We prove an explicit estimate on the rate of convergence of the infinite continued fraction and several surprising analogs of classical formulas about continued fractions.

Correct rounding of algebraic functions

Nicolas Brisebarre, Jean-Michel Muller (2007)

RAIRO - Theoretical Informatics and Applications

We explicit the link between the computer arithmetic problem of providing correctly rounded algebraic functions and some diophantine approximation issues. This allows to get bounds on the accuracy with which intermediate calculations must be performed to correctly round these functions.

Counting invertible matrices and uniform distribution

Christian Roettger (2005)

Journal de Théorie des Nombres de Bordeaux

Consider the group SL 2 ( O K ) over the ring of algebraic integers of a number field K . Define the height of a matrix to be the maximum over all the conjugates of its entries in absolute value. Let SL 2 ( O K , t ) be the number of matrices in SL 2 ( O K ) with height bounded by t . We determine the asymptotic behaviour of SL 2 ( O K , t ) as t goes to infinity including an error term, SL 2 ( O K , t ) = C t 2 n + O ( t 2 n - η ) with n being the degree of K . The constant C involves the discriminant of K , an integral depending only on the signature of K , and the value of the Dedekind zeta function...

Counting rational points near planar curves

Ayla Gafni (2014)

Acta Arithmetica

We find an asymptotic formula for the number of rational points near planar curves. More precisely, if f:ℝ → ℝ is a sufficiently smooth function defined on the interval [η,ξ], then the number of rational points with denominator no larger than Q that lie within a δ-neighborhood of the graph of f is shown to be asymptotically equivalent to (ξ-η)δQ².

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