Now I know why I should have taken math in school :) This is very impressive. This is sooo far removed from my daily job as "business application" developer, which makes it the more interesting. Thanks for posting.

I do. Not SAP. but Microsoft. Yes, Microsoft has an ERP product. (a 'suite' even: Dynamics) I've also worked with another ERP product. And you are right, there are a lot of opportunities, but it is also hard to get a foothold.