SEMI-VEKTOREN UND SPINOREN. [Semi-Vectors and Spinors]. Sonderausgabe [Offprint] aus den Sitzungsberichten der Preussischen Akademie der Wissenschaften, physikalisch-mathematischen Klasse, XXXII (1932).

First offprint in the original wrappers and new pagination, of this rare seminal paper, at the same time Einstein's last publication before having to leave Nazi-Germany. - Content: Present paper ist the last work by Einstein, co-authored once again by Walther Mayer, that was published in Weimar Germany (Weil no. 187 was printed before). The offprint was distributed by the Prussian exactly a week before the Nazis came to power on January 30th 1933. Einstein, and also Mayer, would have to flee Germany due to their Jewish origins only a few months later. - Einstein's work on semivectors "was stimulated by Ehrenfest's insistence on a better understanding of the relation between single-valued and double-valued representations of the Lorentz group . . . [Einstein and Mayer] went on to relate semivectors to the Dirac equation and to generalize the formalism to general relativity" (Pais, Subtle is the Lord, pp. 451-452). - Condition: Mint. - Reference: Alicke 152; Boni-Russ-L. 217; Schilpp-Shields 250; Weil 186 (quotes the pagination of the first separate printing, p. 522-550).