"Since the mathematicians have invaded the theory of relativity, I do not understand it myself anymore."
— Albert Einstein

January 1, 1970

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Albert Einstein
Original Language: English

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As quoted in the essay "To Albert Einstein's Seventieth Birthday" by Arnold Sommerfeld, Albert Einstein : Philosopher-Scientist (1949) edited by Paul A. Schilpp (p. 102). The essay, originally published as "Zum Siebzigsten Geburtstag Albert Einsteins" in Deutsche Beiträge (Eine Zweimonatsschrift) Vol. III, No 2, 1949, was translated specifically for the book by Schilpp.