EntityQ2193452· pop 8· linked from 37 articlesEuler classSign in to savedegree r characteristic class defined for a real oriented vector bundle of rank r on a paracompact spaceConnectionsvector bundleEntitycharacteristic classEntityStiefel–Whitney classEntitymathematicsEntityLeonhard EulerEntityInternational Standard Book NumberEntitymanifoldEntityalgebraic topologyEntityJohn MilnorEntityEuler characteristicEntityLie groupEntityPrinceton University PressEntityhomologyEntityRaoul BottEntityHassler WhitneyEntityhairy ball theoremEntityn-sphereEntityorientabilityEntitytangent bundleEntitycohomologyEntityCategoriesCharacteristic classesVector bundles