1 On the mathematical manuscripts of K. Marx 1 (A Communication) 2 3 Emil Julius Gumbel 4 5 Source: “О ɦɚɬеɦɚɬичеɫких ɪɭкɨɩиɫях К. Мɚɪкɫɚ 6 (Сɨɨɛщеɧие),” Леɬɨɩɢɫɢ маɪкɫɢɡма (Мɨɫкɜɚ), 3/1927: 56- 7 60. 8 9 We know from the correspondence of Marx and Engels (from: 10 Marб’s letters to Engels dated 20 May 1865 and 25 August 11 1879, Engels’ letters to Marб dated 18 August 1881 and 21 12 November 1882, and Marб’s replв of 22 November 1882) that 13 they studied mathematics. It is evident from their 14 correspondence that Marx was studying differential calculus 15 way back in 1865; he did so especially intensively in the years 16 1881and 1882 and, that Engels went through his mathematical 17 manuscripts. Further, we find in the “Anti-Dühring” (Dietz 18 Verlag edition of 1923, pp. 139 and 140) that Engels 19 understood differentiation in the sense of a dialectical 20 negation. Finally, there are separate remarks on algebra in the 21 “Dialectics of Nature” published bв the Institute of K. Marб 22 and F. Engels. 23 <David Borisovich> Riazanov located a large number of 24 notebooks and sheets of paper with mathematical contents 25 within the manuscripts of Marx, lying at the Archives of the 26 Social-Democratic Party of Germany. He took some steps to 27 get these materials published before the <first world> war, but 28 failed. He had also <unsuccessfully> approached <Friedrich> 29 Adler for publishing a mathematical work of Marx that was 30 completely ready for the press. At present the Institute of K. 31