Characteristic classes | Differential topology

Pontryagin class

In mathematics, the Pontryagin classes, named after Lev Pontryagin, are certain characteristic classes of real vector bundles. The Pontryagin classes lie in cohomology groups with degrees a multiple of four. (Wikipedia).

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Tangent bundle | Shiing-Shen Chern | Curvature form | Homotopy | Homeomorphism | Signature (topology) | Quaternion | Cohomology | Hirzebruch signature theorem | Glossary of differential geometry and topology | Rational number | André Weil | Stiefel–Whitney class | Euler class | Complexification | Differentiable manifold | De Rham cohomology | Characteristic class | Cup product | Chern–Simons form | Mathematics | Integer | Fundamental class | N-sphere | Vector bundle | Cobordism | Connection form | Manifold | Orthogonal group | Chern class | Clutching construction