# 100th ring on the Database of Ring Theory

Would you like to be the contributor for the 100th ring on the Database of Ring Theory? Go here!

# 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.