- IntegerAddition - uses vectors to visualize addition of positive and negative values.
- NormalDistribution - find probabilities for regions of a normal distribution.
- ThreeCircles - demonstrates drawing three mutually tangent circles centered at the vertices of any triangle.

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The idea is the same for each type of problem - turn the cells green by clicking pairs of cells which are equivalent.

Things to note:

- These pages are "proof-of-concept" attempts, not commercial products. Much could be improved and/or added. Hopefully some will.
- This is expected to render correctly on Firefox, but probably not on other browsers.
- Firefox is supporting "presentation markup". I don't know about "content markup".
- There are some quirks in generating MathML with Javascript, especially when creating "entities".
- Yes, I know I'm generating some ill-formed MathML - fighting Javascript and the browser are my current excuses.

Suggestions of comments? Zap me an email (w e b m a s t e r @ p r a i r i e m a t h . c o m). Input is appreciated, but it's not my day job, so you may not hear back.