Are there any good **short** expositions of planar algebras out there? I am interested primarily in seeing the main definition and some explicit examples.



Short Introduction to Planar Algebras
My paper with Emily and Noah about the [`D_{2n}` planar algebra](http://arxiv.org/abs/0808.0764) includes our attempt at a friendly explanation. It's all about arguably the simplest non-trivial example of a *subfactor* planar algebra.


