Posed in regional mathematics Olympiad 2005
63689
proving roots of equation $x^2+x+4f=0$ are real.
110401
Specifying geography with cardinal directions
63571
The Mississipi counting problem, this time in circle
106485
Olympiad Geometry Problem
28617
High-quality RegionPlot3D for logical combinations of predicates
44620
Reference for combinatorial game theory.
101642
Counting in a rectangular grid with obstacles
92514
Math book: Exercise - Solution environment
76042
Introduction to statistics for mathematicians
82056
Quadrilateral problem with midpoints of diagonals
3420
Uniqueness of Extended Euclidean Algorithm
111656
Estimation of the expected Euclidean distance between two random points on a unit $n$-hemisphere
69235
padded boundary of convex hull
3651
Site - Cell Correspondence in Voronoi Diagram obtained via VoronoiMesh
43076
Chess tournament combinatorics
21397
Tournament Brackets algorithm
134440
An unexpected application of non-trivial combinatorics