Introduction to the Project

I begin to believe that mathematics (at least at undergraduate level) is more or less about pattern recognition.  Therefore, I created "practice cards" along the syllabus of the free textbook Abstract Algebra: Theory and Applications by Thomas W. Judson.  There is a copyright on all materials below, and subsequently it is licensed with a GNU Free Documentation License (GFDL) (same as the aforementioned book).  All subsequent derivation of the following materials should be put under the same condition (free to access for the public).  

There are slight changes of sequences in presenting the materials.

The links are as below (with a sample card chosen in the deck):