Comment by sillyinseattle

Commenters are clearly trying to help. They can do better if you provide more context. What kind of math do you want to do? This does not have to be related to your dissertation area. And since you are asking on HN .. what kind of hacking/ development do you want to do? Coming from academia (I have a phd in game theory -- kind of useless in real world, other than ad auctions), it gets easier to find an industry job and develop idea of a good fit once you already have one! Don't be too picky to start with. Good luck!