Interestingly enough this notion, that there is only this one type of probability was debated before Kolmogorov by people like Ramsey and Keynes. Now the subjec

Interestingly enough this notion, that there is only this one type of probability was debated before Kolmogorov by people like Ramsey and Keynes. Now the subjective interpretation of probability is called Bayesian statistics, which is not a helpful term. http://plato.stanford.edu/entries/probability-interpret/ http://plato.stanford.edu/entries/probability-interpret/