This paper introduces a novel segmentation technique, called pearling, for identifying tubular structures in images. Examples of such structures include, but are not limited to, blood vessels, bones, roads, rivers, electrical wirings, and brush-strokes. Pearling allows the user to extract a higher level parametric representation of each tube or of a network of tubes. This representation is comp...

Let F be a nonarchimedean local field of characteristic 0 and residue order not divisible by 2. We show how to calculate the product covolume torsion-free lattice in PGL(2,F) formal dimension discrete series representation GL(2,F). The comes from theorem Ihara, dimensions are contained results Corwin, Moy, Sally. By going back Atiyah, triviality second cohomology group free group, resulting is ...

Write E for the stable discrete series character associated to an irreducible nite-dimensional representation E of a connected real reductive group G. Let M be the centralizer of the split component of a maximal torus T , and denote by M ( ; E) Arthur's extension of jDG M ( )j 12 E( ) to T (R). In this paper we give a simple explicit expression for M ( ; E), when is elliptic in G. We do not ass...