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Five physical assumptions are proposed that together entail the generalqualitative results, including the Born rule, of non-relativistic quantummechanics by physical and information-theoretic reasoning alone. Two of theseassumptions concern fundamental symmetries of physical interactions. The thirdconcerns the Hilbert-space dimensions and the fourth and fifth theself-interaction Hamiltonians of the systems that function as "observers"within the theory. These assumptions are shown to provide a sufficientmotivation for the usual Hilbert-space formalism, and to obviate theobservation-related axioms and most interpretative assumptions with whichminimal quantum mechanics is typically supplemented.

Quantum mechanics from five physical assumptions