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[AUTHOR'S COPY] ARCHIVES of Dimitri RIABOUCHINSKY RIABOUCHINSKY, Dimitri (1882–1962) • Doctorate in Mathematical Sciences awarded to D.P. Riabouchinsky in France following the defense of his dissertation at the Faculty of Sciences of the University of Paris. Dissertation defended on June 15, 1922; degree awarded on April 20, 1923. 27 × 43 cm. • Theses submitted to the Faculty of Sciences of Paris to obtain the degree of Doctor of Mathematical Sciences, by Mr. Dimitri Riabouchinsky, founder and director of the Kuchino Aerodynamic Institute. First dissertation—Research in Hydrodynamics. Second dissertation—On the General Equations of Motion of Solid Bodies in an Incompressible Liquid. Defended on June 15, 1922, before the Examination Committee. Published by Gauthier-Villars et Cie, Paris, 1922. In French, 132 pp., in-4, later binding, as is (tears along the spine) Among the examiners were the French mathematician Gabriel Koenings (chair of the committee), a professor at his faculty; the renowned mathematician Émile Borel; and the French mathematicians Paul Montel and Henri Villat. [AUTHOR’S COPY] ARCHIVE OF Dmitry RYABUSHINSKY RYABUSHINSKY, Dmitry (1882–1962) • Doctor of Mathematical Sciences diploma issued to D.P. Ryabushinsky in France following the defense of his dissertation at the Faculty of Natural Sciences of the University of Paris. Defended on June 15, 1922; awarded on April 20, 1923. 27 × 43 cm. • Dissertations submitted to the Faculty of Natural Sciences at the University of Paris for the degree of Doctor of Mathematical Sciences by Mr. Dmitry Ryabushinsky, founder and director of the Institute of Aerodynamics in Cucino. First dissertation: Studies in Hydrodynamics. Second dissertation: On the General Equations of Motion of Rigid Bodies in an Incompressible Fluid. Submitted for defense on June 15, 1922, before the examination committee. Published by Gauthier-Villars et Cie, Paris, 1922. In French, 132 pages, 25 × 20 cm, owner’s binding, in fair condition (tears in the spine) Among Dmitry Ryabushinsky’s examiners were: French mathematician Gabriel Koenigs (chairman of the committee), a professor at his faculty and renowned mathematician Émile Borel, as well as French mathematicians Paul Montel and Henri Villat.