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References to 'colouring problem'
1. Acano a lunar calendar method by milogardner
2. bipartite graph by mathcam
3. bipartite matching by mathcam
4. calculator by PrimeFan
5. chromatic number by mathcam
6. chromatic number of a metric space by Mathprof
7. colorings of plane graphs by marijke
8. compass and straightedge construction of regular pentagon by Wkbj79
9. empirical proof that solving opposing faces of a Rubik's cube does not necessarily solve the middle layer by PrimeFan
10. example of counting theorem by aoh45
11. example of pairwise independent events that are not totally independent by bbukh
12. finite projective plane by Mathprof
13. four-color conjecture by bbukh
14. graph theory by karteef
15. Heawood number by bbukh
16. k-partite graph by bbukh
17. Kempe chain by marijke
18. KKM lemma by uriw
19. Mandelbrot set by PrimeFan
20. Mayan math by milogardner
21. nonogram by mps
22. poker by PrimeFan
23. principal components analysis by akrowne
24. proof of Vizing's theorem (for graphs) by marijke
25. proof of Wagner's theorem by Ziosilvio
26. property B by bbukh
27. quantum chromodynamics (QCD) by bci1
28. Ramsey's theorem by bbukh
29. Ramsey-theoretic proof of the Erd\H{o}s-Szekeres theorem by mps
30. Rubik's cube by PrimeFan
31. supercategory by bci1
32. Tait coloring by marijke
33. the difference of two odd squares is always a multiple of 8 by PrimeFan
34. the top 10 most beautiful theorems by PrimeFan
35. Vizing's theorem by marijke