New posts in combinatorial-geometry

How many hyperplanes does it take to separate $n$ points in $\mathbb{R}^m$?

combinatorics convex-analysis combinatorial-geometry

IMO 2013 Problem 6

number-theory contest-math problem-solving combinatorial-geometry

Minimum number of circles with 3 neighbors

geometry circles combinatorial-geometry extremal-combinatorics

When is a polyhedron uniquely determined by its projections?

geometry convex-geometry polyhedra combinatorial-geometry polytopes

Minimum number of hemispheres covering a sphere

geometry induction combinatorial-geometry

Minimal circle containing set of points

geometry optimization circles combinatorial-geometry

Positivity of the alternating sum associated to at most five subspaces

linear-algebra combinatorics vector-spaces homological-algebra combinatorial-geometry

British Mathematical Olympiad - December 2001 - Round 1 - Question 4

combinatorics combinatorial-geometry

Configurations of eleven (or more) points in the Euclidean plane, such that out of any four there is a pair at unit distance.

graph-theory euclidean-geometry combinatorial-geometry plane-geometry

Coloring $\mathbb R^n$ with $n$ colors always gives us a color with all distances.

combinatorics contest-math combinatorial-geometry

What is the expected convex depth of a set of $m$ randomly chosen points in the unit square?

probability general-topology probability-theory convex-analysis combinatorial-geometry

Is the figure the circumference of a unit circle?

geometry circles combinatorial-geometry

Is every shape possible with a snake?

puzzle combinatorial-geometry

Several rectangles cover the unit square. Can I find a disjoint set of them whose area is at least $1/4$?

combinatorics geometry combinatorial-geometry

Tiling of a $9\times 7$ rectangle

contest-math combinatorial-geometry tiling

Venn diagram with rectangles for $n > 3$

combinatorics discrete-mathematics combinatorial-geometry rectangles

Number of ways to distribute objects, some identical and others not, into identical groups

combinatorics combinatorial-geometry

Combinatorially equivalent polyhedra?

terminology polyhedra combinatorial-geometry

Surface of the intersection of $n$ balls

geometry surfaces combinatorial-geometry spheres convex-geometry

Probability Based on a Grid of Lights

probability combinatorics combinatorial-geometry geometric-probability