Acknowledgments iv
Introduction 1
Chapter I. Basic Existence and Comparison Results 5
Chapter II. A Result of Bris
Chapter III. A Theorem of Erdelyi 20
Chapter IV. More General Boundary Conditions 25
Chapter V. The Quasilinear Problem and Related Differential Inequalities 32
Chapter VI. Approximation Theory 45
Chapter VII. More on Approximation Theory 63
Chapter VIII. Some Extensions 68
Appendix. Comments on the Literature 73
Bibliography ?4
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