“As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.”

—  Albert Einstein

Insofern sich die Sätze der Mathematik auf die Wirklichkeit beziehen, sind sie nicht sicher, und insofern sie sicher sind, beziehen sie sich nicht auf die Wirklichkeit. http://books.google.com/books?id=QF0ON71WuxEC&q=%22Insofern+sich+die+S%C3%A4tze+der+Mathematik+auf+die%22&pg=PA3#v=onepage

Geometrie and Erfahrung (1921) pp. 3-4 link.springer.com http://link.springer.com/chapter/10.1007%2F978-3-642-49903-6_1#page-1 as cited by Karl Popper, The Two Fundamental Problems of the Theory of Knowledge (2014) Tr. Andreas Pickel, Ed. Troels Eggers Hansen.
Ref: en.wikiquote.org - Albert Einstein / Quotes / 1920s

http://books.google.com/books?id=QF0ON71WuxEC&q=%22beziehen+sind+sie+nicht+sicher+und+insofern+sie+sicher+sind+beziehen+sie+sich+nicht+auf+die+Wirklichkeit%22&pg=PA4#v=onepage
1920s, Sidelights on Relativity (1922)

Original

Insofern sich die Sätze der Mathematik auf die Wirklichkeit beziehen, sind sie nicht sicher, und insofern sie sicher sind, beziehen sie sich nicht auf die Wirklichkeit.

Geometrie und Erfahrung. Erweiterte Fassung des Festvortrages gehalten an der Preußischen Akademie der Wissenschaften zu Berlin am 27. Januar 1921. Julius Springer Berlin 1921, S. 3 f. archive.org http://archive.org/stream/geometrieunderf00einsgoog/geometrieunderf00einsgoog_djvu.txt. Zitiert in: "Mein Weltbild", hgg. v. Carl Seelig, 1991, S. 196ff.
Naturwissenschaft

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Albert Einstein 702
German-born physicist and founder of the theory of relativi… 1879–1955

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