RE: https://infosec.exchange/@fbz/117348410740393804 I was just in Krakow, Poland and was a little surprised not to find any tributes to Sierpinski there. I know he spent much of his life and career in Warsaw though. He did his doctorate in Krakow around 1905-1906. Then at one point at the end of world war ii after the Warsaw uprising, having all his papers, books and letters being burned, and being forcible deported to a transit camp, he apparently walked 64 km back to Krakow to pick up teaching mathematics again, before later returning to Warsaw. I need a Sierpinski biography to corroborate but I think that's the general idea.