Four Postulates of Quantum Mechanics Are Three.

@article{Carcassi2021FourPO,
  title={Four Postulates of Quantum Mechanics Are Three.},
  author={Gabriele Carcassi and Lorenzo Maccone and Christine A. Aidala},
  journal={Physical review letters},
  year={2021},
  volume={126 11},
  pages={
          110402
        }
}
The tensor product postulate of quantum mechanics states that the Hilbert space of a composite system is the tensor product of the components' Hilbert spaces. All current formalizations of quantum mechanics that do not contain this postulate contain some equivalent postulate or assumption (sometimes hidden). Here we give a natural definition of a composite system as a set containing the component systems and show how one can logically derive the tensor product rule from the state postulate and… 

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