"The result of this consideration is therefore as follows. If for collisions of material points the conservation laws are to hold for an arbitrary (Lorentz) coordinate-system, the well known expressions for impulse and energy follow, as well as the validity of the principle of equivalence of mass and rest-energy."
FIRST EDITION IN RARE ORIGINAL WRAPPERS of one of Einstein's most complete proofs of his most famous equation, e=mc2; the text of the prestigious Gibbs Lecture, delivered at Pittsburgh on December 28, 1934.
Einstein "gave two proofs [of e=mc2] in his later years. In 1934 he gave the Gibbs lecture in Pittsburgh and deduced [e=mc2] from the validity in all inertial frames of energy and momentum conservation for a system of point particles. In 1946 he gave an elementary derivation in which the equation for the aberration of light and the radiation of pressure are assumed given" (Pais, Subtle is the Lord, 148).
IN: Bulletin of the American Mathematical Society, Vol. XLI, No. 4, pp. 223-230. Menasha, Wis., and New York: The American Mathematical Society, April 1935. Octavo, original wrappers. Spine a little faded and a hint of wear at spine ends; generally fine. Rare in wrappers.