I quite enjoyed this series of essays in Game Theory. The standouts to me were P.J. Hammond, Martin Shubik, Roger Myerson, and Reinhard Selten himself. There were quite a few errors from various mathematicians earlier on in the book. I do say, it's always disheartening when I am able to show that something you've introduced into the middle of the paper is a non-equivalence (it isn't true). A couple of these papers simply assimilated the findings of various Game Theorists and others notated the difference between cardinal and ordinal utility, basically how Game Theory was founded, in contradistinction to marginal utility within economics. The axiomization of cardinal, linear utility however, was something that was introduced by Von Neumann and maintained by many others, which makes it able to study objective group and coalitional behavior. This is understood via Harsanyi, where any sort of realizations whatsoever occur when you are taking a linear utility, because in reference to some objective standard of value. So therefore, like in the original Theory of Games and Economic Behavior, Harsanyi was able to show results, with a linear tracing method, whose t value could essentially be equated as the same thing as the knowledge of the other players' parameters (hidden variables) and the structure of their stochastic behavioral function.
Mathematicians like Selten also could do this very same thing, and a good example of Selten's logic at work is his mathematical paper on the derivation of behavioral choices within 3 person, step-wise games. The findings there and elsewhere of course, pave the way for a brighter avenue of help in the future with AI and general optimal decision making for large organizations/governments.