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This tag is used if a reference is needed in a paper or textbook on a specific result.

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Who proved that two homotopic embeddings of one surface in another are isotopic?

If $\Sigma_1$ and $\Sigma_2$ are two compact topological surfaces with boundary and $\phi, \psi : \Sigma_1 \hookrightarrow \Sigma_2$ are two orientation-preserving embeddings that are homotopic, then …
Dylan Thurston's user avatar
6 votes

Approximation of topological dynamical systems?

In general, dynamical properties of dynamical systems are often quite unstable. The Mandelbrot set makes one nice parameter: the base equation $z \mapsto z^2 + c$ is varies continuously with respect t …
Dylan Thurston's user avatar
3 votes
Accepted

Conformal invariants of planar pairs of pants

There are several references that consider the relation between extremal length and hyperbolic length. Usually they consider closed surfaces, but you can put yourself in that situation by doubling alo …
Dylan Thurston's user avatar