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Smooth manifolds and smooth functions between them. For manifolds with additional structure, see more specific tags, such as [riemannian-geometry]. For more topological aspects, see [differential-topology].

17 votes
2 answers
997 views

Homotopy equivalent but non-homeomorphic high-dimensional manifolds

I have a question motivated by the classification theory of simply-connected closed $4$-manifolds. Questions: Given any $n\geq 5$, is it possible to find two simply-connected closed $n$-manifolds $M$ …
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  • 1,097
2 votes
1 answer
291 views

In which dimensions is it true that every topological ball embedded by a smoothly embedded s...

I asked a question on MSE with no answer. Here is my question in the generalized version. Question 1: Suppose we are given a connected three-manifold $M$ (possibly non-compact, or non-orientable) and …
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  • 1,097
3 votes
0 answers
189 views

The boundary of the transversal pre-image of a submanifold with boundary

A similar question on MSE without answer. Let $M, N$ be smooth manifolds such that $\partial N=\varnothing$. Let $A$ be a smoothly embedded submanifold of $N$ such that $\partial A\neq \varnothing$. S …
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  • 1,097
1 vote
1 answer
143 views

Transversal pre-image of a small enough trivial tubular neighborhood contains a trivial tubu...

A similar post on MSE without answer. Let $f\colon M'\to M$ be a smooth map between two orientable closed smooth manifolds and $S$ be a smoothly embedded closed orientable submanifold of $M$ of co-dim …
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  • 1,097
3 votes
0 answers
193 views

An almost complex structure on $\Bbb S^n$ induces a cross product on $\Bbb R^{n+1}$

It is known that the only spheres that admit an almost complex structures are $\Bbb S^2$ and $\Bbb S^6$ (Borel and Serre, 1953). In particular, $\Bbb S^4$ cannot be given an almost complex structure ( …
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  • 1,097