On Maps From Loop Suspensions To Loop Spaces And The Shuffle Relations On The Cohen Groups


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On Maps from Loop Suspensions to Loop Spaces and the Shuffle Relations on the Cohen Groups


On Maps from Loop Suspensions to Loop Spaces and the Shuffle Relations on the Cohen Groups

Author: Jie Wu

language: en

Publisher: American Mathematical Soc.

Release Date: 2006


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The maps from loop suspensions to loop spaces are investigated using group representations in this article. The shuffle relations on the Cohen groups are given. By using these relations, a universal ring for functorial self maps of double loop spaces of double suspensions is given. Moreover the obstructions to the classical exponent problem in homotopy theory are displayed in the extension groups of the dual of the important symmetric group modules Lie$(n)$, as well as in the top cohomology of the Artin braid groups with coefficients in the top homology of the Artin pure braid groups.

On Maps from Loop Suspensions to Loop Spaces and the Shuffle Relations on the Cohen Groups


On Maps from Loop Suspensions to Loop Spaces and the Shuffle Relations on the Cohen Groups

Author: Jie Wu

language: en

Publisher: American Mathematical Soc.

Release Date: 2006


DOWNLOAD





The maps from loop suspensions to loop spaces are investigated using group representations in this article. The shuffle relations on the Cohen groups are given. By using these relations, a universal ring for functorial self maps of double loop spaces of double suspensions is given. Moreover the obstructions to the classical exponent problem in homotopy theory are displayed in the extension groups of the dual of the important symmetric group modules Lie$(n)$, as well as in the top cohomology of the Artin braid groups with coefficients in the top homology of the Artin pure braid groups.

Stability of Spherically Symmetric Wave Maps


Stability of Spherically Symmetric Wave Maps

Author: Joachim Krieger

language: en

Publisher: American Mathematical Soc.

Release Date: 2006


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Presents a study of Wave Maps from ${\mathbf{R}}^{2+1}$ to the hyperbolic plane ${\mathbf{H}}^{2}$ with smooth compactly supported initial data which are close to smooth spherically symmetric initial data with respect to some $H^{1+\mu}$, $\mu>0$.