Singular Perturbations and Differential Inequalities

Β· American Mathematical Society: Memoirs of the American Mathematical Society αžŸαŸ€αžœαž—αŸ…αž‘αžΈ 168 Β· American Mathematical Soc.
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The author discusses the singularly perturbed second-order boundary value problem [lowercase Greek]Epsilon [italic]yβ€²β€² = [italic]f([italic]t,[italic]y,[italic]yβ€², [lowercase Greek]Epsilon), by means of several second-order differential inequality theorems. This article not only gives a unified presentation of much of the body of results on this boundary value problem obtained in the last twenty years or so, but contains very considerable improvements involving less demanding conditions (sometimes leading to weaker results) in some cases, more precise results (sometimes under more severe restrictions) in other cases, and a more thorough investigation of the general boundary conditions. Some potential extensions to transition point problems and the like are indicated (but not carried out in detail) in the last section.

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