Limited Holism and Real-Vector-Space Quantum Theory

@j_bertolotti @RobertSpekkens One feature of complex q. mechanics is "local tomography" - the state of any composite system can be reconstructed from measurements on its components. For real-space quantum mechanics this is not the case and you need to join

@johncarlosbaez The result is mentioned in this paper (https://t.co/YuTd22Vczl) and some references in it. It also shows that a real-vector-space quantum theory cannot have the above mentioned property (also called local tomography).