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Nonnegative solutions of ODEs. (English) Zbl 1082.65547
Summary: This paper discusses procedures for enforcing nonnegativity in a range of codes for solving ordinary differential equations (ODEs). The codes implement both one-step and multistep methods, all of which use continuous extensions and have event finding capabilities. Examples are given.

65L05 Numerical methods for initial value problems involving ordinary differential equations
65L06 Multistep, Runge-Kutta and extrapolation methods for ordinary differential equations
34A34 Nonlinear ordinary differential equations and systems
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