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On a similar note, my own choice is Egan's Diaspora. Most of the characters are sentient software, and it explores some of the implications of being able to fork oneself, or rewrite your software. On top of that the physics is, to the best of my mildly-educated knowledge, an extension of General Relativity consistent with what we already know; and part of it takes place in a six-dimensional spacetime.

The only other Egan I've read is his collection Luminosity, which was similarly impressive. I'm definitely going to check him out further.

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