8 How many ways to colour a $4 \times 4$ grid using four colours subject to three constraints 5 Can the boy escape the teacher for a regular $n$-gon? 4 Idempotent and commutative Latin squares of even order. 4 If $\gamma\colon[a,b]\to\mathbb{C}$ is continuous and $\gamma(b)=-\gamma(a)$, must the curves $\gamma$ and $e^{ic}\gamma$ intersect for all real $c$? 4 Probability of decreasing random structures

Reputation (4,052)

 +5 Dividing a graph into $k$ subgraphs +10 Idempotent and commutative Latin squares of even order. +10 Scheduling a Round Robin tournament - 4-way games +10 Are there always two circles that together surround or intersect all points in the following scenario?

Questions (36)

 42 Proving a jigsaw is possible 22 Longest path in a square grid 15 Selecting a menu 13 Strategy for board game 2 10 Overlapping circles covering polygon

Tags (135)

 46 combinatorics × 40 16 probability × 11 44 geometry × 61 13 circles × 15 27 trigonometry × 29 10 latin-square × 2 23 puzzle × 14 9 logic × 6 17 recreational-mathematics × 34 9 contest-math × 5