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Quelques nouveaux invariants des difféomorphismes Morse--Smale d'une surface

Rémi Langevin — 1993

Annales de l'institut Fourier

Soit f un difféomorphisme Morse-Smale d’une surface fermée. À une courbe instable de comportement 1 par rapport à un attracteur A de f correspond une courbe fermée sur un des tores (Bassin ( A ) - A ) / ( f ) . Cette remarque nous permettra de définir de nouveaux invariants de conjugaison de f . Nous en déduisons aussi un moyen d’écrire explicitement une puissance de f comme le produit du temps 1 d’un champ de vecteurs Morse-Smale topologique par des isotopies à support des disques et des twists de Dehn de supports...

The sublexical structure of a sign language

Lucinda Ferreira BritoRémi Langevin — 1994

Mathématiques et Sciences Humaines

Analyzing and transcribing a sign language is a difficult task since the mode of expression - hand movements in a space located close to the body, complemented by attitudes and facial expressions - is a priori less sequential than speech. Our work aims to complete numerous previous attempts and uses in particular Stokoe’s system. Analysing the movement of a frame attached to the hand as the movement of a point in R 3 × S O ( 3 ) we manage to discretize in a natural way the most frequent gestures of the [LSCB]...

Application of spaces of subspheres to conformal invariants of curves and canal surfaces

Rémi LangevinJun O'HaraShigehiro Sakata — 2013

Annales Polonici Mathematici

We review some techniques from the Möbius geometry of curves and surfaces in the 3-sphere, consider canal surfaces using their characteristic circles, and express the conformal curvature, and conformal torsion, of a vertex-free space curve in terms of its corresponding curve of osculating circles, and osculating spheres, respectively. We accomplish all of this strictly within the framework of Möbius geometry, and compare our results with the literature. Finally, we show how our formulation allows...

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