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Aug 27, 2019 at 17:36 comment added Iosif Pinelis You don't need regular versions for a monotone class argument here, because taking limits of (monotone) sequences of sets preserves the almost-sure property of the conditional probabilities.
Aug 27, 2019 at 15:01 comment added Nicolas Bourbaki I have one more question. Why is it sufficient to restrict ourselves to rectangle sets $A\times B$ in this case? If a regular version does not exist, how can a monotone class argument be used to extend to arbitrary sets in the product $\sigma-$field?
Aug 27, 2019 at 13:43 comment added Nicolas Bourbaki Thank you Losif!
Aug 27, 2019 at 13:25 history answered Iosif Pinelis CC BY-SA 4.0