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Displaying 81 – 100 of 202

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Minimal, rigid foliations by curves on n

Frank Loray, Julio C. Rebelo (2003)

Journal of the European Mathematical Society

We prove the existence of minimal and rigid singular holomorphic foliations by curves on the projective space n for every dimension n 2 and every degree d 2 . Precisely, we construct a foliation which is induced by a homogeneous vector field of degree d , has a finite singular set and all the regular leaves are dense in the whole of n . Moreover, satisfies many additional properties expected from chaotic dynamics and is rigid in the following sense: if is conjugate to another holomorphic foliation...

Minimizing movements for dislocation dynamics with a mean curvature term

Nicolas Forcadel, Aurélien Monteillet (2009)

ESAIM: Control, Optimisation and Calculus of Variations

We prove existence of minimizing movements for the dislocation dynamics evolution law of a propagating front, in which the normal velocity of the front is the sum of a non-local term and a mean curvature term. We prove that any such minimizing movement is a weak solution of this evolution law, in a sense related to viscosity solutions of the corresponding level-set equation. We also prove the consistency of this approach, by showing that any minimizing movement coincides with the smooth evolution...

Minimizing p -harmonic maps at a free boundary

Frank Duzaar, Andreas Gastel (1998)

Bollettino dell'Unione Matematica Italiana

Studiamo le proprietà di regolarità delle mappe fra varietà di Riemann che minimizzano la p -energia fra quelle che soddisfano una condizione di frontiera pazialmente libera. Proviamo che tali mappe sono Hölder continue vicino alla frontiera libera fuori di un insieme singolare, e otteniamo stime ottimali per la dimensione di Hausdorff di questo insieme singolare.

Minoration de la première valeur propre non nulle du problème de Neumann sur les variétés riemanniennes à bord

Daniel Meyer (1986)

Annales de l'institut Fourier

On établit une minoration pour la première valeur propre non nulle du problème de Neumann sur les variétés riemanniennes à bord; la nécessité des bornes géométriques utilisées est illustrée par une série d’exemples. Cette approche prolonge celle de Li-Yau, qui était limitée à l’étude du cas où le bord est convexe.

Minoration du spectre des variétés hyperboliques de dimension 3

Pierre Jammes (2012)

Bulletin de la Société Mathématique de France

Soit M une variété hyperbolique compacte de dimension 3, de diamètre  d et de volume V . Si on note μ i ( M ) la i -ième valeur propre du laplacien de Hodge-de Rham agissant sur les 1-formes coexactes de M , on montre que μ 1 ( M ) c d 3 e 2 k d et μ k + 1 ( M ) c d 2 , où c > 0 est une constante ne dépendant que de V , et k est le nombre de composantes connexes de la partie mince de M . En outre, on montre que pour toute 3-variété hyperbolique M de volume fini avec cusps, il existe une suite M i de remplissages compacts de M , de diamètre d i + telle que et μ 1 ( M i ) c d i 2 .

Currently displaying 81 – 100 of 202