My last post was about the life of Évariste Galois and his contributions to abstract algebra. Between that podcast and my recent addiction to Rummikub, this thought process then led me, or distracted me, to thinking about number sets and groups. These mathematicians have written about groups, then about swimming, and the current Olympic trials for swimming, which then conveniently led me back to abstract algebra, which was the topic of my last post on Evariste Galois. My brain went full circle!