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This "Riabouchinsky solid" appears to be original research: I cannot find anything on it. And otherwise this concept was already found worthless at the end of the 19th or beginning of the 20th century, see d'Alembert's paradox and the references to Batchelor there. However, his contributions to fluid dynamics and physics were significant. In fluid dynamics for instance with respect to so-called cavity flows. -- Crowsnest ( talk) 10:06, 29 March 2009 (UTC) reply