Abstract
Effects are defined in this paper as observable changes in the state of a macrosystem, which are caused by interaction with a microsystem. These effects are the starting point of Ludwig's axiomatic foundation of quantum theory. In this theory the concept of commensurability is developed by considering effects which can be caused together, by one single microsystem. Such effects are called coexistent. It is shown that in ordinary quantum mechanics the formal definition of coexistence and the corresponding postulates given by Ludwig are consistent with the dynamics of interaction processes leading to effects.
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References
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Part of a work supported by the Deutsche Forschungsgemeinschaft.
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Hellwig, K.E. Coexistent effects in quantum mechanics. Int J Theor Phys 2, 147–155 (1969). https://doi.org/10.1007/BF00669562
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DOI: https://doi.org/10.1007/BF00669562