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Construction of Optimal Linear Codes by Geometric Puncturing

Maruta, Tatsuya (2013)

Serdica Journal of Computing

Dedicated to the memory of S.M. Dodunekov (1945–2012)Abstract. Geometric puncturing is a method to construct new codes. ACM Computing Classification System (1998): E.4.∗This research was partially supported by Grant-in-Aid for Scientific Research of Japan Society for the Promotion of Science under Contract Number 24540138.

Construction of Ray class fields by elliptic units

Reinhard Schertz (1997)

Journal de théorie des nombres de Bordeaux

From complex multiplication we know that elliptic units are contained in certain ray class fields over a quadratic imaginary number field K , and Ramachandra [3] has shown that these ray class fields can even be generated by elliptic units. However the generators constructed by Ramachandra involve very complicated products of high powers of singular values of the Klein form defined below and singular values of the discriminant Δ . It is the aim of this paper to show, that in many cases a generator...

Construction of Šindel sequences

Michal Křížek, Alena Šolcová, Lawrence Somer (2007)

Commentationes Mathematicae Universitatis Carolinae

We found that there is a remarkable relationship between the triangular numbers T k and the astronomical clock (horologe) of Prague. We introduce Šindel sequences { a i } of natural numbers as those periodic sequences with period p that satisfy the following condition: for any k there exists n such that T k = a 1 + + a n . We shall see that this condition guarantees a functioning of the bellworks, which is controlled by the horologe. We give a necessary and sufficient condition for a periodic sequence to be a Šindel sequence....

Constructions de polynômes génériques à groupe de Galois résoluble

Odile Lecacheux (1998)

Acta Arithmetica

On sait que les seuls sous-groupes résolubles transitifs du groupe symétrique ₅ sont isomorphes au groupe de Frobenius 20 , au groupe diédral D₅ et au groupe cyclique C₅. Nous montrerons comment construire des extensions de degré 5 à groupe de Galois résoluble à l’aide de courbes elliptiques. Dans un premier paragraphe nous utiliserons une courbe elliptique ayant un point de 5-torsion rationnel pour les groupes D₅ et C₅. Puis, dans le paragraphe suivant, nous utiliserons une courbe elliptique ayant...

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