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That result, coupled with the pioneering work of Philip Hartman on what was then called unrestricted \u003cem\u003en\u003c\/em\u003e-parameter families, has stimulated 50 years of development in the study of solutions of boundary value problems as nonlinear interpolation problems.\u003c\/p\u003e\u003cp\u003eThe purpose of this book is two-fold. First, the results that have been generated in the past 50 years are collected for the first time to produce a comprehensive and coherent treatment of what is now a well-defined area of study in the qualitative theory of ordinary differential equations. 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