In previous episodes, we discussed the multiverse's sole "prediction" that we are typical observers in a typical universe. However, this ignored the major problem that it doesn't seem possible for an infinite varied multiverse to use probabilities to make any prediction whatsoever because there are an infinite number of copies of every possible universe!

To get around this problem, multiverse scientists use something called measures to compute probabilities in an infinite multiverse and then determine what a typical universe looks like. They thereby attempt to rescue multiverse theory from the fatal flaws of a naive multiverse, but end up running directly into the measure problem we'll discuss next time.

Timestamps:

0:00 - Opening

1:42 - From a Naive Multiverse to Measures

4:30 - The Problem of Infinities and Probabilities

6:51 -Measures

11:45 - True and False Predictions

14:27 - The Boltzmann Brain Measure

Get essay versions of all episodes in Season 1: Intelligent Cause and Season 2: Analyzing & Rejecting Multiverse

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Infinities and Measures - S2:E9

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