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Many-worlds interpretation
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=== Branch counting === In 2021, [[Simon Saunders]] produced a branch counting derivation of the Born rule. The crucial feature of this approach is to define the branches so that they all have the same magnitude or [[norm (mathematics)|2-norm]]. The ratios of the numbers of branches thus defined give the probabilities of the various outcomes of a measurement, in accordance with the Born rule.<ref name=BranchCounting>{{Cite journal|last=Saunders|first=Simon|author-link=Simon Saunders|date=24 November 2021|title=Branch-counting in the Everett interpretation of quantum mechanics.|journal=Proceedings of the Royal Society A|language=en|volume=477|issue=2255|pages=1β22 |doi=10.1098/rspa.2021.0600|issn=|arxiv=2201.06087|bibcode=2021RSPSA.47710600S |s2cid=244491576 }}</ref>
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