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The study of differentiable manifolds and differentiable maps. One fundamental problem is that of classifying manifolds up to diffeomorphism. Differential topology is what Poincaré understood as topology or “analysis situs”.

6 votes

references / general idea of kervaire invariant problem

Snaith's book is good place to look. Also, Hopkins lecture at Atiyah's birthday is awesome. It was caled the doomsday conjecture because of what would happen in the EHP sequence if these elements were …
Sean Tilson's user avatar
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2 votes

How does all of the bundles over a certain manifold characterize the homotopy class of the b...

All the above answers are great, but as you are just learning this stuff, the following might be helpful. Vector/$G$-bundles contain actual geometric information! The tangent bundle, for example, tell …
Sean Tilson's user avatar
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