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Source https://t.co/1RL0ml4W4q
Source https://t.co/1RL0ml4W4q
@JulzRoze One of my favorite books is https://t.co/jE0TBFYBTL
Dale: "So rich that the set of iso'm classes of k-dim'l vector bundles over a paracompact space B is in a natural bijective corresp. with the set of homotopy classes of mappings of B into the Grassmannian manifold of k-dim'l subspaces in inf-dim'l space!"