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EINSTEIN, Albert (1879–1955). Typed letter signed (“A. Einstein”) to mathematical physicist Mr. Daniel M. Lipkin, Princeton, 1 October 1952. One page, 8vo (279 x 216 mm), on The Institute for Advanced Study School of Mathematics letterhead, creased. With original transmittal envelope. EINSTEIN CRITIQUES A SET OF EQUATIONS SENT BY HIS CORRESPONDENT. “The possibility of this choice of coordinate system is quite obvious and generally known. It is, however, an incomplete determination fixing only 1 of the 4 arbitrary functions. For developing the theory generally it seems to me better not to specialize the coordinate system at all.” Daniel Lipkin was a New York native who first wrote to Einstein in 1944, continuing his correspondence with the physicist after completing his studies at Princeton under Einstein’s friend David Bohm. Lipkin went on to design early computers for Sperry Univac and later worked at American Electronic Laboratories as an electrical engineer for 30 years where he held seven patents based on his theories.