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so:text The development during the present century is characterized by two theoretical systems essentially independent of each other: the theory of relativity and the quantum theory. The two systems do not directly contradict each other; but they seem little adapted to fusion into one unified theory. (en)
so:description 1940s (en)
qkg:hasContext qkg:Context191976
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qkg:Quotation369004 qkg:hasMention
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