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dc.contributor.authorArnold, Vladimir
dc.date.accessioned2011-05-09T09:03:41Z
dc.date.available2011-05-09T09:03:41Z
dc.date.issued2003
dc.identifier.urihttps://basepub.dauphine.fr/handle/123456789/6213
dc.language.isoenen
dc.subjectarithmeticsen
dc.subjectquadratic formsen
dc.subjectDe Sitter's worlden
dc.subjectcontinued fractionen
dc.subjectsemigroupen
dc.subjecttri-groupen
dc.subject.ddc516en
dc.titleArithmetics of binary quadratic forms, symmetry of their continued fractions and geometry of their de Sitter worlden
dc.typeArticle accepté pour publication ou publié
dc.description.abstractenThis article concerns the arithmetics of binary quadratic forms with integer coefficients, the De Sitter's world and the continued fractions. Given a binary quadratic forms with integer coefficients, the set of values attaint at integer points is always a multiplicative "tri-group". Sometimes it is a semigroup (in such case the form is said to be perfect). The diagonal forms are specially studied providing sufficient conditions for their perfectness. This led to consider hyperbolic reflection groups and to find that the continued fraction of the square root of a rational number is palindromic. The relation of these arithmetics with the geometry of the modular group action on the Lobachevski plane (for elliptic forms) and on the relativistic De Sitter's world (for the hyperbolic forms) is discussed. Finally, several estimates of the growth rate of the number of equivalence classes versus the discriminant of the form are given.en
dc.relation.isversionofjnlnameBulletin of the Brazilian Mathematical Society
dc.relation.isversionofjnlvol34en
dc.relation.isversionofjnlissue1en
dc.relation.isversionofjnldate2003
dc.relation.isversionofjnlpages1-42en
dc.relation.isversionofdoihttp://dx.doi.org/10.1007/s00574-003-0001-8en
dc.description.sponsorshipprivateouien
dc.relation.isversionofjnlpublisherSpringeren
dc.subject.ddclabelGéométrieen


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