This is a chapter about the Anthropic Principle, and how you apply Bayesian reasoning where you have reason about the probability of your own existence, which seems like a very strange question. It's a fun question, though – which you can almost define as a question where it's much easier to have an opinion than to have a result. But then, we can try to at least clarify the issues, and there are some interesting results that we can get.

There's a central proposition that many people interested in rationality believe they should base their lives around – even though they generally don't in practice. This is Bayes's Theorem.

If you talk to philosophers, this is often the one mathematical fact that they know. (Kidding!) ...

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