EINSTEIN, ALBERT Die Grundlage der allgemeinen Relativitätstheorie
. Leipzig: Verlag von Johann Ambrosius Barth, 1916. First edition, monograph issue, with printer's imprint "Druck von Metzger & Wittig in Leipzig" to verso of title, and "Metzger & Wittig, Leipzig" to back wrapper. Original wheat-colored paper wrappers. Housed in a clamshell case with a black levant spine. This has a window mount with a slip of paper bearing the mass-energy equivalence formula as E = MC^(2), signed and dated "A. Einstein/1949". 9 x 6 3/8 inches (23 x 16 cm); 64,  pp. Wrappers slightly toned, some darkening and wear to spine, overall a sound copy. The Einstein signature with a letter of authenticity prepared by David Lowenherz of Lion Heart Autographs; the formula was possibly added later.
Much more than simply an offprint from the Annalen Der Physik, volume 49, 1916, where it first appeared, the work was significantly reimposed for this publication, which has a separate title page, table of contents, an introduction by Einstein etc. It is the first separate appearance of the General Theory of Relativity, mathematically integrating Einstein's 1905 Special Theory with the Newtownian laws of gravitation. By any standard, this is one of the central intellectual achievements that define 20th century physics. The theory has become so widely assimilated into the culture that it colors even lay perceptions of the universe. Grolier/Horblit 26c; Norman 696; PMM 408; Weil Checklist (1960), 80a.
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