125

Answers
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170
What’s a mathematician to do?
114
Lecture notes by Thurston on tiling
72
Is there an underlying explanation for the magical powers of the Schwarzian derivative?
50
Are there any very hard unknots?
47
Nash embedding theorem for 2D manifolds
46
Computing homotopies
41
Volumes of n-balls: what is so special about n=5?
37
Maneuvering with limited moves on $S^2$
36
When can a Connection Induce a Riemannian Metric for which it is the Levi-Civita Connection?
34
When does iterating z -> z^2 + c have an exact solution?
34
Can we add two matrices by performing an operation on their eigenvalues & eigenvectors?
33
Invertible matrices of natural numbers are permutations… why?
31
Riemann mapping theorem for homeomorphisms
31
Riemannian surfaces with an explicit distance function?
29
Is there a simple proof that a group of linear growth is quasi-isometric to Z?
27
Trapped rays bouncing between two convex bodies
25
Many flat totally geodesic surfaces ⇒ flat?
25
Transpositions of order three
24
transformation properties of divergence (of a vector field)
24
Minimal polynomial with a given maximum in the unit interval
24
What upper bounds are known for the diameter of the minimum spanning tree of $n$ uniformly random points in $[0,1]^2$?
23
Is the sphere the only surface all of whose projections are circles? Or: Can we deduce a spherical Earth by observing that its shadows on the Moon are always circular?
22
Why are there no wild arcs in the plane?
22
Does the amenability problem for Thompson’s group $F$ predate 1980?
21
Totally geodesic surfaces in fibered 3-manifolds
20
Finite groups with elements of the same order
19
Which motion is exclusive in 3D or higher dimensions?
19
Why is it so hard to implement Haken’s Algorithm for knot theory?
19
Is there a Poincare-Hopf Index theorem for non compact manifolds?
18
Detecting a cover of the figure-8 knot complement
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