‎CHAPLYGIN (S.A.)‎
‎Priblizhennoye integritovaniye obyknovennogo differentsialnogo uravneniya pervogo poryadka [in cyrillic]. - (INTEGRATION APPROXIMATIVE DES EQUATIONS DIFFERENTIELLES ORDINAIRES DU PREMIER ORDRE ; CONFERENCE DONNEE LE 4 DECEMBRE 1919) -- EDITION ORIGINALE‎

‎Petrograde, 1920, un volume in 8, broché couverture imprimée, 20pp.‎

Reference : 1161

‎---- EDITION ORIGINALE ---- RARE ---- "This Russian mathematician and physicist graduated from the University of Moscow, later teaching mathematics there on the recommendation of Zukovsky. Interested in classical mechanics, especially the mechanics of liquids and gases, Chaplygin continued the work of St. Venant on jet streams and contributed to aerodynamics through his studies of wing cross section. Chaplygin's works also enriched mathematics : his studies of methods of approximation for solving differential equations are achievements of mathematical thought". (DSB III pp. 194/197 et Bibliotheca Mechanica p. 69) - (N° 20)**1161/cart‎