Philosophy Lexicon of Arguments

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I 247
Measuring/Geometry/Feynman: there are properties that are independent of the particular type of measurement. For example, the distance between two points in a rotated coordinate system when one of the two points is in the origin.
The square of the distance is x² + y² + z².
What about space-time?

Space-Time/Geometry/Feynman: it is easy to show that there is also an invariance here:
I 248
The combination c²t² x² y² z² is the same before and after the transformation:

c²t' ² x' ² y' ² z' ² = c²t² x² y² z².

Ontology/Feynman: this quantity is something that like distance is "real" in a sense. It is called the Def "interval" between two space-time points.


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Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution.

Fey
R. Feynman
Vom Wesen physikalischer Gesetze München 1993

Fey I
R. Feynman
Vorlesungen über Physik I München 2001


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Ed. Martin Schulz, access date 2017-11-23