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Wei_Dai comments on Shock Level 5: Big Worlds and Modal Realism - Less Wrong
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I spent a lot of time in the late 90s trying to work out a coherent system of thinking about probabilities that involved things like "your subjective experience has an equal chance of continuing down any branch" but could not make it work out.
Eventually I gave up and went down the road of UDASSA and then UDT, but "your subjective experience has an equal chance of continuing down any branch" seems to be the natural first thing that someone would think of when they think about probabilities in the context of multiple copies/branches. I wish there is a simple and convincing argument why thinking about probabilities this way doesn't work, so people don't spend too much time on this step before they move on.
The implied difference between making N copies straight away, and making two copies and then making N-1 copies of one of them, might be a simple convincing argument that something really odd is going on.
It doesn't? If I flip a fair coin, I can think of the outcomes as "my subjective experience goes down the branch where heads comes up" and "my subjective experience goes down the branch where tails comes up", and the principle works.