A general theory of the functions depending on a continuous set of values of another function, this volume is based on the author's fundamental notion of the transition from a finite number of variables to a continually infinite number. Deals primarily with integral equations, and also addresses the calculus of variations. 1930 edition. Unabridged republication of the edition published by Blackie and Son, Glasgow, 1930.
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Hill's Equation by Wilhelm Magnus, Stanley Winkler This two-part treatment explains basic theory and details, including oscillatory solutions, intervals of stability and instability, discriminants, and coexistence. Particular attention to stability problems and coexistence of periodic solutions. 1966 edition.
Lectures on Cauchy's Problem in Linear Partial Differential Equations by Jacques Hadamard Basing his research on prior studies by Riemann, Kirchhoff, and Volterra, the author extends and improves Volterra's work, applying its theories relating to spherical and cylindrical waves to all normal hyperbolic equations. 1923 edition.
Theory of the Integral by Stanislaw Saks An excellent introduction to modern real variable theorem, this volume covers all the standard topics such as theory, theory of measure, functions with general properties, and theory of integration.
