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earned this badge 358 times.
Billiard dynamics for multiple balls
Awarded Oct 4, 2011 at 19:50
Gently falling functions
Awarded Sep 28, 2011 at 18:35
Shortest closed curve to inspect a sphere
Awarded Sep 20, 2011 at 21:50
Ping-pong relief map of a given function z=f(x,y)
Awarded Sep 13, 2011 at 17:05
Surface equivalent of catenary curve
Awarded Sep 7, 2011 at 0:05
Titles composed entirely of math symbols
Awarded Sep 5, 2011 at 6:50
Light rays bouncing in twisted tubes
Awarded Aug 23, 2011 at 0:20
Counting restricted polyominoes
Awarded Aug 2, 2011 at 0:05
Average degree of contact graph for balls in a box
Awarded Jul 28, 2011 at 2:50
Billiard dynamics under gravity
Awarded Jul 15, 2011 at 17:05
Totally rational polytopes
Awarded Jul 15, 2011 at 12:35
The quaternion moat problem
Awarded Jul 9, 2011 at 18:50
Functions approximated by rolling epicycle curves
Awarded Jul 7, 2011 at 12:35
Thom's Principle: rich structures are more numerous in low dimension
Awarded Jun 29, 2011 at 19:35
Characterizing graphs by their "walkers"
Awarded Jun 18, 2011 at 7:05
Growing random trees on a lattice $\rightarrow$ Voronoi diagrams
Awarded Jun 13, 2011 at 17:20
Convex hull on a Riemannian manifold
Awarded May 23, 2011 at 17:05
Determining a surface in $\mathbb{R}^3$ by its Gaussian curvature
Awarded May 23, 2011 at 13:20
Chord arrangement that avoids confining small or large disks
Awarded May 21, 2011 at 21:35
Topple height of randomly stacked bricks
Awarded May 12, 2011 at 22:50
Why is the half-torus rigid?
Awarded May 10, 2011 at 22:20
Why so difficult to prove infinitely many restricted primes?
Awarded May 1, 2011 at 7:50
Higher-dimensional Catalan numbers?
Awarded Apr 13, 2011 at 2:35
Probing a manifold with geodesics
Awarded Apr 11, 2011 at 9:50
Why do we use $\varepsilon$ and $\delta$?
Awarded Mar 25, 2011 at 12:35
"Rolling Geodesics": Designing a $k$-putt green
Awarded Feb 11, 2011 at 23:21
Periodic lightray paths trapped between two nested mirror circles
Awarded Feb 11, 2011 at 23:05
Laplacians on graphs vs. Laplacians on Riemannian manifolds: $\lambda_2$?
Awarded Feb 11, 2011 at 12:20
Ratio of circumscribed/inscribed $(n{-}1)$-gons
Awarded Feb 9, 2011 at 20:35
Fraktur symbols for Lie algebras
Awarded Jan 25, 2011 at 21:20
Polygons uniquely inducing arrangements
Awarded Jan 22, 2011 at 17:20
Pinball on the infinite plane
Awarded Jan 3, 2011 at 3:35
Gaussian prime spirals
Awarded Jan 2, 2011 at 18:05
Optimal wireframe sphere
Awarded Jan 2, 2011 at 17:50
Covering a Cube with a Square
Awarded Jan 2, 2011 at 17:35
Exploding primes
Awarded Jan 2, 2011 at 17:20
Covering a unit ball with balls half the radius
Awarded Dec 27, 2010 at 12:35
Kervaire invariant: Why dimension 126 especially difficult?
Awarded Dec 22, 2010 at 19:05
Tetris-like falling sticky disks
Awarded Dec 15, 2010 at 12:35
Prime spiral distribution into quadrants
Awarded Dec 13, 2010 at 19:35
Is $\partial X$ a sphere for $X$ a complete CAT$(0)$ space?
Awarded Dec 10, 2010 at 23:50
Partitions of $\mathbb{R}^d$ by implicit polynomial equations
Awarded Dec 8, 2010 at 18:35
Detecting a hidden convex body with line probes
Awarded Dec 4, 2010 at 23:05
How many binary operations are associative?
Awarded Dec 2, 2010 at 16:05
A sudden smiley? :-)
Awarded Nov 21, 2010 at 6:35
The geometry of crinkled aluminum foil
Awarded Nov 20, 2010 at 4:05
The sparsest planar net that captures every unit segment
Awarded Nov 15, 2010 at 3:35
There are two points on the Earth's surface that ... ?
Awarded Oct 31, 2010 at 12:20
Particles chasing one another around a circle
Awarded Oct 18, 2010 at 20:50
Smallest square to wrap a cylinder
Awarded Oct 2, 2010 at 18:50
The kissing number of a square, cube, hypercube?
Awarded Sep 15, 2010 at 14:50
To what extent does trajectory determine gravity sources?
Awarded Sep 5, 2010 at 18:20
Does erosion mix faster than a riffle shuffle?
Awarded Jul 10, 2010 at 12:05
Measures of non-abelian-ness
Awarded Jul 3, 2010 at 22:20
Surfaces filled densely by a geodesic
Awarded Jun 28, 2010 at 15:05
Can every $\mathbb{Z}^2$ disk be pinball-reached?
Awarded Jun 27, 2010 at 16:35
Random rings linked into one component?
Awarded Jun 14, 2010 at 8:35
A curious sequence of rationals: finite or infinite?
Awarded May 27, 2010 at 1:05
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