MATHEMATICAL ENGINEERING TECHNICAL REPORTS Computational Results for Gaussian Moat Problem

نویسنده

  • Nobuyuki TSUCHIMURA
چکیده

Can one walk to infinity on Gaussian primes taking steps of bounded length?” We adopted computational techniques to probe into this open problem. We propose an efficient method to search for the farthest point reachable from the origin, which can be parallelized easily, and have confirmed the existence of a moat of width k = √ 36, whereas the best previous result was k = √ 26 due to Gethner et al. A refinement of Vardi’s estimate for the farthest distance reachable from the origin is proposed. The proposed estimate incorporates discreteness into Vardi’s that is based on percolation theory.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

A Computational Study of Metabolism in Sprinting (TECHNICAL NOTE)

In this paper, we develop a mathematical model of sprinting in which anaerobicmetabolism is included. This model is simplified by considering the broad changes of energy leveland the cyclic variation associated with the strike pattern. We consider the effect of the centre of massto the overall energy balance along with force of resistance during initial motion of body. Results areobtained for t...

متن کامل

Resource Constrained Project Scheduling with Material Ordering: Two Hybridized Meta-Heuristic Approaches (TECHNICAL NOTE)

Resource constrained project scheduling problem (RCPSP) is mainly investigated with the objective of either minimizing project makespan or maximizing project net present value. However, when material planning plays a key role in a project, the existing models cannot help determining material ordering plans to minimize material costs. In this paper, the RCPSP incorporated with the material order...

متن کامل

Reliability Optimization for Complicated Systems with a Choice of Redundancy Strategies (TECHNICAL NOTE)

Redundancy allocation is one of the common techniques to increase the reliability of the bridge systems. Many studies on the general redundancy allocation problems assume that the redundancy strategy for each subsystem is predetermined and fixed. In general, active redundancy has received more attention in the past. However, in real world, a particular system design contains both active and col...

متن کامل

A Stroll Through the Gaussian Primes

THE MOAT PROBLEM. One cannot walk to infinity on the real line if one uses steps of bounded length and steps on the prime numbers. This is simply a restatement of the classic result that there are arbitrarily large gaps in the primes. The proof is simple: a gap of size k is given by (k + 1)! + 2, (k + 1)! + 3, ... (k + 1)! + (k + 1). But the same problem in the complex realm is unsolved. More p...

متن کامل

MATHEMATICAL ENGINEERING TECHNICAL REPORTS A Localization Approach to Improve Iterative Proportional Scaling in Gaussian Graphical Models

We discuss an efficient implementation of the iterative proportional scaling procedure in the multivariate Gaussian graphical models. We show that the computational cost can be reduced by localization of the update procedure in each iterative step by using the structure of a decomposable model obtained by triangulation of the graph associated with the model. Some numerical experiments demonstra...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2004