Mention48752

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so:text Light signals alone provide the metrical structure of the four-dimensional space-time continuum. The construction may be called light axioms. (en)
so:isPartOf https://en.wikiquote.org/wiki/Hans_Reichenbach
so:description ยง 27 (en)
so:description The Philosophy of Space and Time (1928, tr. 1957) (en)
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