Ian Short

Here are some problems I developed for NRICH on disconnecting sets of points. Introduction There is an island, shown below, which contains five towns, each marked by a coloured disc. The people from the red towns are arch rivals with the people from the blue towns, so they decide to build a wall to separate […]

Yesterday it snowed and I made an arch from the snow. Some local kids helped for a while, before attacking me with snowballs. Later on that evening, after a long patient wait with Ellie’s camera, I caught the perfect shot. A unique moment. The following day some more local kids – possibly the same ones […]