Abstract
Variable stepsize stability results are found for three representative multivalue methods. For the second order BDF method, a best possible result is found for a maximum stepsize ratio that will still guarantee A(0)-stability behaviour. It is found that under this same restriction, A(α)-stability holds for α≈70°. For a new two stage two value first order method, which is L-stable for constant stepsize, A(0)-stability is maintained for stepsize ratios as high as aproximately 2.94. For the third order BDF method, a best possible result of (1/2)(1+\(\sqrt {\text{5}}\)) is found for a ratio bound that will still guarantee zero-stability.
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Reference
N. Guglielmi and M. Zennaro, On the zero-stability of variable stepsize multistep methods: The spectral radius approach, to appear in Numer. Math.
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Butcher, J., Heard, A. Stability of Numerical Methods for Ordinary Differential Equations. Numerical Algorithms 31, 59–73 (2002). https://doi.org/10.1023/A:1021108006254
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DOI: https://doi.org/10.1023/A:1021108006254