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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

Unstable manifolds of a Morse function give a CW complex

Let us show that there exists a metric for which stable and unstable manifolds of a given Morse function are transverse. By Kupka-Smale theorem, a Morse function $f$ on a manifold with a Riemannian m …
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Codimension zero embeddings and maps with small fibers

Isn't the following an example? Build $M$ starting from the plane by attaching an infinite sequence of handles whose size decreases to zero. Take for $N$ the disjoint union of $M_k$, where $M_k$ is th …
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