It says on Wikipedia that
[Nicole Oresme] also worked on fractional powers, and the notion of probability over infinite sequences, ideas which would not be further developed for the next three and five centuries, respectively.
Does anyone know of a translated work or summary (preferably English) of Oresme's work on fractional powers specifically?
You can find some material (partial translation and commentary) into the "old classic" :
and of course the full translation into :
For Oresme's generalization of traditional theory of proportions, including (in modern terms) fractional exponents, see :