Ideal triangulations of 3-manifolds II; taut and angle structures.
Ideal triangulations of hyperbolic -manifolds
Quello delle triangolazioni geodetiche ideali è un metodo molto potente per costruire strutture iperboliche complete di volume finito su 3-varietà non compatte, ma non è noto se il metodo sia applicabile in generale. È tuttavia noto che esistono triangolazioni ideali parzialmente piatte, ma l'analisi della situazione diviene più ardua sotto diversi aspetti, quando si ha a che fare con tetraedri piatti oltre che veri tetraedri. In particolare, la topologia dello spazio di identificazione può degenerare,...
Ideal Turaev-Viro invariants.
Immersed and virtually embedded -injective surfaces in graph manifolds.
Incidence algebras and algebraic fundamental group.
Incompressibilité des feuilles de germes de feuilletages holomorphes singuliers
Nous considérons un germe de feuilletage holomorphe singulier non-dicritique défini sur une boule fermée , satisfaisant des hypothèses génériques, de courbe de séparatrice . Nous démontrons l’existence d’un voisinage ouvert de dans tel que, pour toute feuille de , l’inclusion naturelle induit un monomorphisme au niveau du groupe fondamental. Pour cela, nous introduisons la notion géométrique de « connexité feuilletée » avec laquelle nous réinterprétons la notion d’incompressibilité....
Incompressible punctured tori in the complements of alterning knots.
Incompressible spanning surfaces and maximal fibred submanifolds.
Incompressible surfaces in 2-bridge knot complements.
Increasing trees and Kontsevich cycles.
Indecomposable racks of order .
Independence complexes of stable Kneser graphs.
Indice des sous facteurs, algèbres de Hecke et théorie des noeuds
Inexistence de structures affines sur les fibrés de Seifert.
Infinite order amphicheiral knots.
Infinitely many two-variable generalisations of the Alexander-Conway polynomial.
Infinitesimal computations in topology
Infinitesimal Morita homomorphisms and the tree-level of the LMO invariant
Let be a compact connected oriented surface with one boundary component, and let be the fundamental group of . The Johnson filtration is a decreasing sequence of subgroups of the Torelli group of , whose -th term consists of the self-homeomorphisms of that act trivially at the level of the -th nilpotent quotient of . Morita defined a homomorphism from the -th term of the Johnson filtration to the third homology group of the -th nilpotent quotient of . In this paper, we replace groups...
Injective morphisms between Artin-Tits groups. (Morphismes injectifs entre groupes d'Artin-Tits.)
Instability of the eikonal equation and shape from shading
In the shape from shading problem of computer vision one attempts to recover the three-dimensional shape of an object or landscape from the shading on a single image. Under the assumptions that the surface is dusty, distant, and illuminated only from above, the problem reduces to that of solving the eikonal equation |Du|=f on a domain in . Despite various existence and uniqueness theorems for smooth solutions, we show that this problem is unstable, which is catastrophic for general numerical algorithms. ...