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Abstract Algebra Online
Contains many of the definitions and theorems from the area of mathematics generally called abstract algebra. Intended for undergraduate students taking an abstract algebra class at the junior/senior level, as well as for students taking their first graduate algebra course. (infos)Intro to Abstract Algebra
Paul Garrett's detailed and comprehensive lecture notes in abstract algebra. (infos)
Octonions and Sedenions
Enter the world of 8 and 16 dimensional hypercomplex numbers and discover that the laws that we take as granted do not always hold. (infos)
IDA: Algebra Interactive
An HTML-based book by Arjeh M. Cohen, Hans Cuypers and Hans Sterk. It focuses on an algorithmic approach to algebraic structures. Many of these tools and examples use the computer algebra package GAP. Site has samples and errata. (infos)
Algebraic Areas of Mathematics
Topics include number theory, groups and sets, commutative rings, algebraic geometry, and linear algebra. (infos)
A Catalogue of Lattices
By Gabriele Nebe and Neil Sloane. (infos)
Abstract Algebra
Lecture notes by David Wilkins, Trinity College, Dublin. Topics in Number Theory; Group Theory; Galois Theory. (infos)
Macdonald Polynomials and the n! Conjecture
Manuscripts and Publications. (infos)
Robbins Algebras Are Boolean
A web text by William McCune describing the solution of this problem by a theorem-proving program, with input files and the proofs. (infos)
Center for Commutative Algebra
A site for the commutative algebra community, including news, conference and preprint announcements, and a huge list of algebraists. (infos)