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Displaying similar documents to “Singularité du spectre de l'opérateur de Schrödinger aléatoire dans un ruban ou un demi-ruban”

Opérateurs de Hecke pour Γ 0 ( N ) et fractions continues

Loïc Merel (1991)

Annales de l'institut Fourier

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Nous rappelons que Manin décrit l’homologie singulière relative aux pointes de la courbe modulaire X 0 ( N ) comme un quotient du groupe Z ( P 1 ( Z / N Z ) ) . En s’appuyant sur des techniques de fractions continues, nous donnons une expression indépendante de N d’un relèvement de l’action des opérateurs de Hecke de H 1 ( X 0 ( N ) , p t e s , Z ) sur Z ( P 1 ( Z / N Z ) ) .

Caractères numériques et fonctions de Macaulay.

Mireille Martin-Deschamps (2004)

Collectanea Mathematica

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The postulation of Aritméticamente Cohen-Macaulay (ACM) subschemes of the projective space PkN is well known in the case of codimension 2. There are many different ways of recording this numerical information: numerical character of Gruson/Peskine, h-vector, postulation character of Martin-Deschamps/Perrin... The first aim of this paper is to show the equivalence of these notions. The second and most important aim, is to study the postulation of codimension 3 ACM subschemes of PN. We...