>>511 つづき
英 mathoverflowは参考になる
http://mathoverflow.net/questions/151286/probabilities-in-a-riddle-involving-axiom-of-choice
Probabilities in a riddle involving axiom of choice - MathOverflow: edited Dec 9 '13 Denis
(抜粋)
The question is about a modification of the following riddle (you can think about it before reading the answer if you like riddles, but that's not the point of my question):

The Riddle: We assume there is an infinite sequence of boxes, numbered 0,1,2,…

. Each box contains a real number. No hypothesis is made on how the real numbers are chosen.
You are a team of 100 mathematicians, and the challenge is the following: each mathematician can open as many boxes as he wants, even infinitely many, but then he has to guess the content of a box he has not opened.
Then all boxes are closed, and the next mathematician can play. There is no communication between mathematicians after the game has started, but they can agree on a strategy beforehand.

You have to devise a strategy such that at most one mathematician fails. Axiom of choice is allowed.
（この後＜11＞でAlexander Prussによる確率分布の議論があるよ）
（抜粋おわり）