I tweaked this to make it a bit clearer while also cleaning up the latex (I think it's standard to use mathrm on multi-letter variable names, to disambiguate them from the multiplication of many single variables, etc. etc.), but I still think that parts of the equation (such as InterpretProb) need types and explanations. (I think you also want to explain how it handles non-halting programs, which requires renormalization in the Solomonoff induction case, unless you want to talk about the semimeasure instead.)