![Abstract algebra [Lecture notes]](https://sensemedia.org/covers/1449000/db34ce63bba0d4125a37225e5a8672b2-g.jpg)
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Thomas C. Craven
![Abstract algebra [Lecture notes]](https://sensemedia.org/covers/1449000/18ad4f695c011e46edf598ae47f40b7e-g.jpg)
![Permutations [expository notes]](https://sensemedia.org/covers/1449000/af974001467f5271e0f7e870033a9732-g.jpg)
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