In this latest edition of Expert to Expert (and Going Deep), the great Brian Beckman, astrophysicist and software architect, is joined by Greg Meredith , a mathematician and computer scientist. It's just bound to be an intellectual jam session!The idea for the format of this conversation is simple: put two geniuses together, give them each a whiteboard and some markers, and see what happens. It's much like free jazz: expert improvisation, seriously geeked-out whiteboard jamming.The content theme for this episode--Monads as coordinate systems--is not simple. To grok this, we need to think in three dimensions: programming, physics and mathematics. But don't worry. Brian and Greg do not expect to be jamming in front of only fellow experts. This is Channel 9, after all, and there are many different levels of knowledge out there amongst our Niner population. Accordingly, you will not feel as though you're watching something in a language you don't speak. That said, you should possess interests in the theoretical, in mathematics, and in physics, and an overall appreciation for learning new things.This is a fantastic whiteboard jam session with two very interesting, very bright, and very knowledgeable experimental theoreticians. Enjoy!Link to Huet's Zipper paper