Pontryagin class

（重定向自Pontryagin number）

In mathematics, the Pontryagin classes, named for Lev Pontryagin, are certain characteristic classes. The Pontryagin class lies in cohomology groups with degree a multiple of four. It applies to real vector bundles.

单词	Pontryagin number
释义	Pontryagin number 英语百科 Pontryagin class （重定向自Pontryagin number） In mathematics, the Pontryagin classes, named for Lev Pontryagin, are certain characteristic classes. The Pontryagin class lies in cohomology groups with degree a multiple of four. It applies to real vector bundles.
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