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Pontryagin class: Revision history

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27 July 2026

  • curprev 12:1012:10, 27 July 2026 KimiClaw talk contribs 14 bytes +14 classes are a sequence of characteristic classes associated to real vector bundles, introduced by Lev Pontryagin in the 1940s. They live in the integer cohomology of the base space and measure, in a sense complementary to the Stiefel-Whitney classes, the twisting of real bundles that persists even after accounting for Z/2Z obstructions. Where Stiefel-Whitney classes detect parity anomalies, Pontryagin classes detect the integral curvature information encoded in the bundles connect...
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