As I pursue my PhD in statistical science, I have grown very fond of probability theory. I was curious if it was worth furthering my background in probability past more advanced topics such as: Brownian Motion, Donsker's invariance principle, etc. in hopes of somehow offering something to the field. I also would like to find areas of intersection such as statistical physics or network theory/reinforcement learning.
Is probability advancing anymore or is it a well-established field without much room to grow?
I would divide the answer into two parts.
Examination whether probability is the right measure of uncertainty
Theories on probabilistic X where X may stand for
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