19 offprints 1951-1968 on mathematical subjects - one inscribed
Wraps. Hartman was an American mathematician at Johns Hopkins University working on differential equations who introduced the Hartman–Grobman theorem. We have, in no material order: On Generalized Ellipses (1959, with Frederick A. Valentine); On Functions Representable as a Difference of Convex Functions (1959); On Exterior Derivatives and Solutions of Ordinary Differential Equations (1959); On Disconjugate Differential Equations (1968); On Disconjugacy Criteria (1970); On Differential Equations and the Function J{mu}2 + Y{mu}2 (1961); On Dichotomies for Solutions of n-th Order Linear Differential Equations (1962, inscribed 'To Juan, Best regards, PH'); On Certain Motone Functions and Products of Independent Functions (i) (1961); On Bounded Green's Kernels for Second Order Linear Ordinary Differential Equations (1951); On Boundary Value Problems for Systems of Ordinary, Nonlinear, Second Order Differential Equations (1960); On an Ordinary Differeential Equation Involving a Convex Function (I) (1969); On a Class of Perturbations of the Harmonic Oscillator (1968); Interpolating Families and Generalized Convex Functions (1967); Geodesic Parallel Coordinates in the Large (1964); On Local Homeomorphisms of Euclidean Spaces (1960); On Limits of Riemann Sums and the Range of Integrals (1968); On Isometric Immersions in Euclidean Space of Manifolds with Non-Negative Sectional Curvatures (1965); On Homotopic Harmonic Maps (1967); On Global Asymptotic Stability of Solutions of Differential Equations (1962, with Czeslaw Olech). From the collection of Juan Jorge Schäffer, math professor at CMU. Each one has a small pencil annotation in upper right corner. Very good. Item #H30264
Price: $125.00