D O C U M E N T 4 5 1 M A R C H 1 9 2 9 4 0 3 and thus Because , therefore then Best regards from your A. Einstein Please send the manuscript[5] and this letter to me at the address Kocherthaler, Am Hirschsprung,[6] so that I can finish working out this matter without a lot of unnec- essary writing. 452. “Hamilton’s Principle and Unified Field Theory” [Berlin, before 18 March 1929][1] [See Doc. 459 in this volume for translation of the published version.] H h 1 2 1 4 – + = H H g h 1 2 2 – + + = 1 h --H 1 2 -- 1 2 -- – 1 2 -- – + + = 1 h -- H H – – + = 1 h --V + + – antisymmetric in and 0 V / 0 H H – / 0. – +