Good point. What I mean is that lots of readers could still get some mileage out of game theory without having to know the rigorous mathematics underlying it (although as you say the mathematics is still there even if someone doesn't know it's there). For example, I don't need to know how to use a fixed point theorem to prove the existence of Nash equilibria for all finite games to be aware of why the prisoner's dilemma is a sticky situation.
Are there any areas of study that you feel are underrepresented here, and would be interesting and useful to lesswrongers?
I feel some topics are getting old (Omega, drama about moderation policy, a newcomer telling us our lack of admiration for his ideas is proof of groupthink, Friendly AI, Cryonics, Epistemic vs. Instrumental Rationality, lamenting how we're a bunch of self-centered nerds, etc. ...), and with a bit of luck, we might have some lurkers that are knowledgeable about interesting areas, and didn't think they could contribute.
Please stick to one topic per comment, so that highly-upvoted topics stand out more clearly.