Publisher Information: Leipzig: Johann Ambrosius Barth, 1907.
Einstein explicitly establishes E=mc2.
Einstein, Albert (1879-1955). (1) Über die Möglichkeit einer neuen Prüfung des Relativitätsprinzips. In Annalen der Physik 23 (6): pp. 197-8. (2) Bemerkungen zu der Notiz von Hrn. Paul Ehrenfest: "Die translation deformierbarer Elektronen und der Flächensatz." In Annalen der Physik 23 (6): pp. 206-8. (3) Über die vom relativitätsprinzip geforderte Trägheit der Energie. In Annalen der Physik 23 (7): pp. 371-384. 8vo. Red cloth, gilt lettering on spine. (214 x 140 mm). [Whole volume: viii, 1000 pp. + 4 plates (numbered Taf. I - IV. Tafs. I, II and IV are folding, Taf. III is b/w silver photograph tipped to sheet)]. Foot of the spine is repaired. Very good.
Approximate English translations of titles: (1) "On the possibility of a new test of the principle of relativity." (2) "Remarks on Mr. Paul Ehrenfest's note: 'The translation of deformable electrons and the surface theorem.'" (3) "On the inertia of energy required by the principle of relativity."In “On the inertia of energy required by the relativity principle” (May 1907), “Using rather than m, V rather than c, and 0 rather than E0, Einstein wrote his famous equation for the first time as V2= 0, and he did it in a footnote. At the end of that paper, he introduced the symbol E0 to denote energy in the rest frame, and wrote the famous expression again, this time as =E0/V2.” -Eugene Hecht, How Einstein confirmed E0 = mc2
In the third paper Einstein explicitly establishes his famous equation E=mc2, although with different symbols. In this paper, Einstein discussed the relationship between inertial mass and energy, arguing for their complete equivalence, namely, that every mass has an equivalent energy just as every form of energy has an equivalent mass. This relation says that a photon can convert for the equivalence of mass and energy, his celebrated equation E = mc2 (Calaprice, The Einstein Almanac).
Weil's Einstein Bibliography, nos. 17, 18 and 19, respectively.
Boni's Einstein Checklist, nos. 17, 18, and 19, respectively.