I am afraid up until now I never heard of "Markowitz theorem" and it is more to do with economic theory than anything I am currently researching.
What I am researching is;
1, new ways to analyze probability distributions with uncertain/unknown parameter values (the current methods for doing this are completely laughable if not deeply flawed and I will mathematically prove that in my book by giving an absolute mathematically prove by contradiction that the conventional solution to the German tank problem is totally wrong + I will give the CORRECT solution to it, which I already derived and have and will show here on requests if anyone is interested; --ANYONE? )
2, apply that to AI by programming AI to use that in probabilistic knowledge-system-based learning algorithms.
3, certain new probability theorems.
4, an ultimate resolution (not a solution) to the problem of induction
5, a real and complete solution to the reference class problem.
6, solutions to certain yet-to-publish paradoxes that I alone have spotted (such as the "suco paradox" and the "heado paradox" etc. )
Like ALL real solutions to paradoxes, they consist of showing how they never existed in the first place!