TITLE: What are "Super Numbers"?
QUESTION [8 upvotes]: I'm reading Hyperspace by Michio Kaku and in the chapter on SuperGravity "Super Numbers" are mentioned and are described as a number system where for any super number $a$, $a*a=-a*a$. I was wondering if anyone knew anything more about these numbers or could point me to another reference about them. Thanks!

REPLY [3 votes]: If you're looking for a reference, the text "Supermanifolds" by Bryce DeWitt provides an excellent pedagogical overview of supernumbers, analysis over supernumbers, supermanifolds, super Lie groups, and supersymmetry.