|Concept: term for an entity with certain properties. The properties of an object correspond to the features of the concept. These concept features are necessary in contrast to the properties of an individual object, which are always contingent.|
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Concept/Measurement/Knowledge/Science/Theory/Feynman: a concept or thought that cannot be measured or directly proven with an experiment can be useful - or not.
It does not need to exist in a theory.
Idea/Concept/Theory/Quantum Mechanics/Feynman: Question: Is the idea of the exact location of a particle and the exact impulse sound or not? The classical theory agrees with this, and quantum mechanics does not.
Theory/Concept/Heisenberg: the new theory (quantum mechanics) does not need to answer such questions, because such questions cannot be asked experimentally.
Measurement/Concept/Feynman: in quantum mechanics, there are many constructions that we cannot directly measure. ((s) But we always talk about them.)
Vom Wesen physikalischer Gesetze München 1993
Vorlesungen über Physik I München 2001