Detailed scientific and mathematical calculations on both sides of a 2.5 x 5.5 off-white slip. On one side Einstein writes nine lines of an intricate mathematical formula, with four additional lines of a longer equation on the reverse, along with a three-word German notation. Professional repair to paper loss of one corner (not affecting any of the writing), and a block of toning over portion of both formulas, otherwise fine condition. A fantastic, and complicated-looking, example of Einstein’s greatest working tool: mathematics. Pre-certified John Reznikoff/PSA/DNA and RR Auction COA.
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