Would you like to be the contributor for the 100th ring on the Database of Ring Theory? Go here!
Links
Database of Ring Theory
You want to find rings having some properties but not having other properties? Go there: Database of Ring Theory! A great repository of rings, their properties, and more ring theory stuff.
Counterexamples to theorems on Clifford algebras
This page provides counterexamples on Clifford algebras, spinors, spin groups and the exterior algebra. You’ll find a list of counterexamples references at the end of the article.
Link to \(\pi\)-Base
Look at pi-Base for a gold mine of topological examples.
Wikipedia Counterexample definition
Want to know more about counterexample definition? Look at Wikipedia.