Einstein and Mathematics
Einstein to Arnold Sommerfeld, 29 December 1912, facsimile

I am working exclusively on the problem of gravitation now, and, with the help of a mathematician friend here, I believe I will master all difficulties. But one thing is certain: I have never toiled this much in all my life, and I have been instilled with great reverence for mathematics, the subtler parts of which I naively used to regard as luxury! Compared with this problem, the original theory of relativity was child’s play.

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