Indiscrete math is a collective noun for all those parts of the mathematical landscape, including but not limited to: In short, any kind of math you wouldn't share a intimate secret with or take home to meet you mom.

Statistical mechanics in NOT considered to be indiscrete math because it is merely an approximation of the infinite state machine that is quantum physics. While technically statistically approximations are indiscrete, because statistical mechanics is approximating a system that is not only provably impossible but also the ultimate in discretion then an exception has been made.