very nice puzzle! i think 30D30DNumber of colours needed to colour in any 2D map, according to a famous theorem in mathematics[----] has an unintended cross-reference lol
Great fun! Maybe say "2-dimensional" or some such in 30D30DNumber of colours needed to colour in any 2D map, according to a famous theorem in mathematics[----]? Or remove the "2D" altogether since virtually everyone will think of a common map.