If you want to help save US federal web pages and databases, here are some things to do. First check to see if they’re already backed up. You can go to the Wayback Machine and type a website’s URL ...

Last time, I talked about the magnitude of a set-valued functor. Today, I’ll introduce the comagnitude of a set-valued functor. I don’t know how much there is to the comagnitude idea. Let’s see! I’ll ...