In this paper, we present averaging results for delay differential equations under weak conditions. The main result is formulated in both classical mathematics and nonstandard analysis. It is proved with internal set theory which is an axiomatic description of nonstandard analysis.
Submitted April 15, 2002. Published July 11, 2002.
Math Subject Classifications: 34C29, 34K25, 03H05.
Key Words: Averaging method, differential equations with delay, nonstandard analysis.
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| Mustapha Lakrib |
Laboratoire de Mathematiques
Universite de Haute Alsace
4, rue des Freres Lumiere
68093 Mulhouse, France
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