Nick Fieller obituary

My father, Nick Fieller, who has died aged 70, was a long-serving statistician at Sheffield University. He had followed in the footsteps of his father, Edgar, a pioneer in the same field, who had devised Fieller’s theorem. Nick focused on different issues, including multivariate analysis, matrix algebra and archeao-statistics (especially Egyptian). He was president of…

Did you solve it? The incredible sponge puzzle

Earlier today I set you the following puzzle, about the intriguing mathematical cube that is the Menger sponge. (To find out how to construct it, you can read the original post here.) When you slice the Menger sponge in two, what does the hexagonal cross-section look like? Here’s the Menger sponge. Illustration: Edmund Harriss/Visions of…