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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”.

1 vote
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Poincaré–Bendixson Theorem on a compact, connected, orientable, two-dimensional manifold

To address your two questions: Why is $q \in N$? If I understand correctly, they could have (and should have) just started with $q \in \Sigma$, since for any $q \in \Sigma$ the orbit $\phi_t(x)$ app …
Martin M. W.'s user avatar
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5 votes
Accepted

Can orientation preserving diffeomorphism in $\mathbb{R}^d$ be presented by flowmap of dynam...

No, this is usually not possible. There's a previous MO question discussing this, but to add to the material there: A time-one map $\phi_1$ commutes with the 1-parameter family of diffeomorphisms $\p …
Martin M. W.'s user avatar
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7 votes
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Fibers of generic smooth maps between manifolds of equal dimension

Yes, the claim is true, and here's a reference. For $M$ compact, your condition is satisfied by a "finite mapping." Such finite mappings form a residual set when $\dim M \leq \dim N$. See pp. 167-169 …
Martin M. W.'s user avatar
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