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Abstract Algebra: We note some useful rules for working with inverses in groups. 1) It is enough to find an inverse on one side only, 2) inverses are unique, and 3) the inverse of a product is the reversed product of the inverses. U.Reddit course materials available at ureddit.com/class/23794/intro-to-group-theory Master list at mathdoctorbob.org/UReddit.html
Includes course on Group Theory (problems and solutions at website) and Ring Theory, and Field Theory. For Prerequisites on proofs and sets, see the Math Major Basics course.