نتایج جستجو برای: douady

تعداد نتایج: 156  

Journal: :Mathematical Research Letters 2010

2009
Gaofei Zhang Yunping Jiang

In 1980’s, Thurston established a combinatorial characterization for post-critically finite rational maps among post-critically finite branched coverings of the two sphere to itself. A completed proof was written by Douady and Hubbard in their paper [A. Douady, J.H. Hubbard, A proof of Thurston’s topological characterization of rational functions, Acta Math. 171 (1993) 263–297]. This criterion ...

Journal: :Computers & Graphics 2004
Miguel Romera Gerardo Pastor Dégano Gonzalo Álvarez Fausto Montoya Vitini

Near to the cusp of a cardioid of the Mandelbrot set, except for the main cardioid, there is a sequence of baby Mandelbrot sets. Each baby Mandelbrot set is in the center of a Douady cauliflower, a decoration constituted by an infinity of minute Mandelbrot sets and Misiurewicz points linked by filaments. A Douady cauliflower appears to have a complicated structure, and how the external rays lan...

2008
Mathieu Stiénon

An equivariant bundle gerbe à la Meinrenken over a G-manifold M is known to be a special type of S-gerbe over the differentiable stack [M/G]. We prove that the natural morphism relating the Cartan and simplicial models of equivariant cohomology in degree 3 maps the Dixmier-Douady class of an equivariant bundle gerbe à la Meinrenken to the Behrend-Xu-Dixmier-Douady class of the corresponding S-g...

1994
M. K. Murray

Just asC principal bundles provide a geometric realisation of two-dimensional integral cohomology; gerbes or sheaves of groupoids, provide a geometric realisation of three dimensional integral cohomology through their Dixmier-Douady class. I consider an alternative, related, geometric realisation of three dimensional cohomology called a bundle gerbe. Every bundle gerbe gives rise to a gerbe and...

Journal: :Journal of Geometry and Physics 2018

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2007
E J R Parteli O Durán H J Herrmann

Barchans are dunes of high mobility which have a crescent shape and propagate under conditions of unidirectional wind. However, sand dunes only appear above a critical size, which scales with the saturation distance of the sand flux [P. Hersen, S. Douady, and B. Andreotti, Phys. Rev. Lett. 89, 264301 (2002); B. Andreotti, P. Claudin, and S. Douady, Eur. Phys. J. B 28, 321 (2002); G. Sauermann, ...

2006
WALTER BERGWEILER D. DRASIN J. K. LANGLEY

We show that there exists an entire function without finite asymp-totic values for which the associated Newton function tends to infinity in some invariant domain. The question whether such a function exists had been raised by Douady.

1995
A. L. Carey M. K. Murray

We show that transgression of the Dixmier-Douady class coming from the natural gerbe arising in the discussion of Faddeev's anomaly is the Faddeev-Mickelsson two cocycle.

Journal: :Advances in Mathematics 2000

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