Skip to main content
Search type Search syntax
Tags [tag]
Exact "words here"
Author user:1234
user:me (yours)
Score score:3 (3+)
score:0 (none)
Answers answers:3 (3+)
answers:0 (none)
isaccepted:yes
hasaccepted:no
inquestion:1234
Views views:250
Code code:"if (foo != bar)"
Sections title:apples
body:"apples oranges"
URL url:"*.example.com"
Saves in:saves
Status closed:yes
duplicate:no
migrated:no
wiki:no
Types is:question
is:answer
Exclude -[tag]
-apples
For more details on advanced search visit our help page
Results tagged with
Search options answers only not deleted user 9062
6 votes
Accepted

Fundamental group of a thick part of hyperbolic manifold

Yes, because $\pi_1$ of the boundary of a component of the $\epsilon$-thin part always surjects to the fundamental group of that thin part, except in one special 2-dimensional case: if there is a shor …
Bill Thurston's user avatar
20 votes
Accepted

Detecting a cover of the figure-8 knot complement

Edited, in light of description of manifold in comments (at end) Added #2: The answer is no, details at the end In principle this is doable, but caution is necessary. Given a manifold tiled by ideal …
Bill Thurston's user avatar
9 votes
Accepted

invariant 2-form in hyperbolic 3-space

In upper half space, the thing that's analogous to the invariant 2-form (which measures hyperbolic area) is the hyperbolic volume form $1/z^3 dx dy dz$. If you want to understand 2-forms invariant by …
Bill Thurston's user avatar
19 votes
Accepted

Is there an explicit bound on the number of tetrahedra needed to triangulate a hyperbolic 3-...

A couple of things are true: 1. If you have any Riemannian manifold of bounded infinitesimal geometry (curvature pinched above and below), its thick part, where the injectivity radius $> \epsilon$, c …
Bill Thurston's user avatar