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Einstein, Albert (1879-1955)

We come now to the question: what is a priori certain or necessary, respectively in geometry (doctrine of space) or its foundations? Formerly we thought everything; nowadays we think nothing. Already the distance-concept is logically arbitrary; there need be no things that correspond to it, even approximately.
Citation: 
"Space-Time." Encyclopaedia Britannica, 14th ed.
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