Authors

C. M. Bender;A. Tovbis

Comments

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Abbreviated Journal Title

J. Math. Phys.

Keywords

STRONG-COUPLING EXPANSION; QUANTUM-FIELD-THEORY; Physics, Mathematical

Abstract

Boundary-layer perturbation theory problems are inherently singular. However, it is known that discretizing the problem by introducing a lattice may convert such problems into regular perturbation problems. The singular nature of boundary-layer problems is then relegated to and hidden in the continuum limit, the subtle limit in which the lattice spacing tends to zero. If the lattice is introduced cavalierly, then extrapolating to zero lattice spacing gives a sequence of extrapolants that at first approaches the correct limit and then veers off, thereby revealing the asymptotic nature of such problems. However, discretizing the problem following the procedures described here yields lattice approximations that have a smooth and regular continuum limit. These ideas are illustrated by three nonlinear ordinary differential equations: the cubic equation that describes instantons, an oscillator equation having a quadratic nonlinearity, and the Blasius equation. (C) 1997 American Institute of Physics.

Journal Title

Journal of Mathematical Physics

Volume

38

Issue/Number

7

Publication Date

1-1-1997

Document Type

Article

Language

English

First Page

3700

Last Page

3717

WOS Identifier

WOS:A1997XM91700002

ISSN

0022-2488

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