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8 votes
0 answers
234 views
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Maps with small fibers between manifolds of equal dimension

The following question is an attempt to revise this one into what I intended. Important revisions are shown in bold. Are there any known examples of a compact Riemannian manifold $M$ with (possibly ...
Matthew Kvalheim's user avatar
5 votes
2 answers
308 views

Is this subset of matrices contractible inside the space of non-conformal matrices?

Set $\mathcal{F}:=\{ A \in \text{SL}_2(\mathbb{R}) \, | \, Ae_1 \in \operatorname{span}(e_1) \, \, \text{ and } \, \, A \, \text{ is not conformal} \,\}$, and $\mathcal{NC}:=\{ A \in M_2(\mathbb{R}) \...
Asaf Shachar's user avatar
  • 6,741
4 votes
1 answer
648 views

Essential simple closed curves on a punctured torus vs those in the torus

Let $T$ be a compact oriented torus, let $p\in T$ be a point, and let $T^*$ be $T - \{p\}$. In Farb-Margalit's Primer on mapping class groups, in the discussion after Proposition 1.5 they say that "...
Will Chen's user avatar
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