What's the mathematical definition of a "world" in the Many World Interpretation of QM?

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I understand that the wave function of the Universe is supposed to be the superposition of all the "worlds", but what's the mathematical difference between two separate worlds, and, for example, an EPR pair existing in a single world? What's the definition of a "world", and what basic mathematical properties does it have?

Are "worlds" supposed to be orthogonal? Does every (majority? how many?) particle in a "world" need to have a precise position?

If the entire Universe was made of only a single EPR pair, how many "worlds" would be there, and why?

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lesniak43

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Posted: 8 months ago
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