TLS signed “A. Einstein,” one page, 8.5 x 11, The Institute for Advanced Study letterhead, October 1, 1952. Letter to mathematical physicist Daniel M. Lipkin, in full: "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." In fine condition. Accompanied by the original mailing envelope.
Daniel Lipkin first wrote to Einstein in 1944 and continued his correspondence with the physicist after completing his studies at Princeton (1946-1949) under Einstein's friend David Bohm. Lipkin went on to work as an electrical engineer working for Sperry Univac designing early computers, and later at American Electronic Laboratories. Some of their correspondence in 1952 concerns the quantum theory and areas where it might be improved.
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