j.c.

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Analogue to covering space for higher homotopy groups?

at.algebraic-topology homotopy-theory asked Oct 17, 2009 at 23:13

mathoverflow.net

29 votes

Largest hyperbolic disk embeddable in Euclidean 3-space?

dg.differential-geometry mg.metric-geometry riemannian-geometry asked Oct 15, 2009 at 0:23

mathoverflow.net

16 votes

Orbifold fundamental group in terms of loops?

orbifolds gt.geometric-topology at.algebraic-topology asked Apr 6, 2010 at 15:27

mathoverflow.net

8 votes

Construction of maps $f:S^3 \to S^2$ with arbitrary Hopf invariant?

gt.geometric-topology asked Oct 28, 2009 at 18:32

mathoverflow.net

7 votes

Generalized Cauchy-Binet sum over a fixed subset of indices

co.combinatorics linear-algebra matrices determinants asked Oct 6, 2014 at 7:45

mathoverflow.net

6 votes

Olympic Badminton, or How to Design a Tournament

combinatorics graph-theory game-theory economics asked Aug 1, 2012 at 22:38

math.stackexchange.com

6 votes

Asymptotics of the number of compositions whose summands are the divisors of a number?

co.combinatorics asymptotics asked Oct 21, 2009 at 22:39

mathoverflow.net

5 votes

A.J. Galitzer's Ph.D. thesis: On the moduli space of closed polygonal linkages on the 2-sphere

reference-request linkage asked Apr 4, 2014 at 10:00

mathoverflow.net

5 votes

When do the solutions of a system of difference equations converge to solutions of a system of PDEs?

pde difference-equations finite-differences asked Sep 11, 2012 at 13:53

math.stackexchange.com

Top Answers

141

Are there examples of non-orientable manifolds in nature?

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Best books for mathematical background?

physics.stackexchange.com

Why does the sky change color? Why is the sky blue during the day, red during sunrise/set and black during the night?

physics.stackexchange.com

What is the exterior derivative intuitively?

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Book about classical mechanics

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Examples where physical heuristics led to incorrect answers?

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Why is tape so hard to rip when it is not broken, but so easy once there is the tiniest cut in it?

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What is the difference between a measurement and any other interaction in quantum mechanics?

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Conway's game of life for random initial position

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Is there a mathematical and information theoretic explanation for this cube packing phenomenon?

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Determining homotopy classes [T^2, RP^2]

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Perfectly centered break of a perfectly aligned pool ball rack

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Link such that deleting any two components leaves an unlink

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Positrons versus holes as positive charge carriers

physics.stackexchange.com

Essentially one random metric on $\mathbb{S}^2$?

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Number theory in Physics

physics.stackexchange.com

The space of triangles that fit inside a given triangle, parametrized by edge lengths

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Work of plenary speakers at ICM 2014

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Do bubbles between plates approximate Voronoi diagrams?

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Is the space of immersions of $S^n$ into $\mathbb R^{n+1}$ simply connected?

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Looking for an introduction to orbifolds

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The example of mechanical system that has a Mobius strip as their configuration space

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Smallest volume representatives of homology

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Topological spaces made by identifying opposite faces of a cube?

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Surfaces in $\mathbb R^3$ with negative curvature bounded away from zero

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Dodecahedral rolling distance

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Orthogonal mud cracks and Maxwell's reciprocal figures

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The geometry of crinkled aluminum foil

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Is there a $W^{2,2}$ isometric embedding of the flat torus into $\mathbb{R}^3$?

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Does homotopy equivalence to a wedge of spheres imply shellability?

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