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Mathematical Foundations of Quantum MechanicsNew Edition$
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John von Neumann

Print publication date: 2018

Print ISBN-13: 9780691178561

Published to Princeton Scholarship Online: September 2018

DOI: 10.23943/princeton/9780691178561.001.0001

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The Measuring Process

The Measuring Process

Chapter VI The Measuring Process
Mathematical Foundations of Quantum Mechanics

John von Neumann

, Robert T. Beyer, Nicholas A. Wheeler
Princeton University Press

This chapter argues that, first, it is inherently correct that measurement or the related process of subjective perception is a new entity relative to the physical environment, and is not reducible to the latter. Indeed, subjective perception leads one into the intellectual inner life of the individual, which is extra-observational by its very nature, since it must be taken for granted by any conceivable observation or experiment. Nevertheless, it is a fundamental requirement of the scientific viewpoint—the so-called principle of psycho-physical parallelism—that it must be possible so to describe the extra-physical process of subjective perception as if it were in the reality of the physical world; i.e., to assign to its parts equivalent physical processes in the objective environment, in ordinary space.

Keywords:   measuring process, composite systems, causal and statistical methods, nature, quantum mechanics, causal change

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