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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!

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    I think you're looking for [Grassmann numbers](http://en.wikipedia.org/wiki/Superspace).2011-03-30
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    Here's the [wikipage for Grassmann numbers](http://en.wikipedia.org/wiki/Grassmann_number). The other page was about their use in supersymmetry, which is probably where the term super number originates from.2011-03-30
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    I don't own a copy of the book, but the table of contents suggests that there is a "References for Suggested Readings" section in Kaku's _Hyperspace_. That would possibly be a good place to start.2011-03-30
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    http://planetmath.org/supernumber2014-06-12

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