In a lecture I attended today, the professor made an off-hand comment of:
"Suppose we have the set $S_n$ of permutations of $\{1, 2, ..., n\}$, which we can think of as a probability space equipped with measure $P( . )$."
I'm not sure what this means - does it mean we have a probability of picking a random permutation with some probability, or something different...?