Andrey N. Sobolev Book order

This book details the contact settings in the Balkans, which present a continuum between separation and symbiosis. It revisits the Sprachbund theory; analyzes contact theories based on new Greek, Albanian, Romance and Slavic data; develops research

This volume presents an unusually accessible introduction to equations fundamental to the investigation of waves, heat conduction, hydrodynamics, and other physical problems. Topics include derivation of fundamental equations, Riemann method, equation of heat conduction, theory of integral equations, Green's function, and much more. The only prerequisite is a familiarity with elementary analysis. 1964 edition.