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3 votes
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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
6 votes

Tiling of genus 2 surface by 8 pentagons

Ian answered the second question as asked, but in case you meant to ask a different question: there is not always a symmetric tiling by regular polygons of the given type, even if those restrictions h …
Dylan Thurston's user avatar
3 votes

teichmuller geodesics and hyperbolic mapping torus

To expand on Lee's answer, recall that Teichmüller space can be divided up into a "thin part" (where some geodesic is short, or equivalently where some conformal annulus has large modulus), and its co …
Dylan Thurston's user avatar
6 votes

Converse to Wolpert's Lemma

The answer is no, but it's actually a deep question and leads to another metric on the Teichmüller space of surfaces. The minimum quasi-conformal constant of a map in a given homotopy class is the Tei …
Dylan Thurston's user avatar
13 votes
2 answers
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Geodesic current supported on a pencil?

Consider a geodesic current $\mu$ on a closed surface $\Sigma$, as defined by Bonahon ("The Geometry of Teichmüller space via geodesic currents"). These are $\pi_1(\Sigma)$-invariant measures on the s …
Dylan Thurston's user avatar