Abstract
The theory of polar forms of polynomials is used to provide sharp bounds on the radius of the largest possible disc (absolute stability radius), and on the length of the largest possible real interval (parabolic stability radius), to be inscribed in the stability region of an explicit Runge–Kutta method. The bounds on the absolute stability radius are derived as a consequence of Walsh’s coincidence theorem, while the bounds on the parabolic stability radius are achieved by using Lubinsky–Ziegler’s inequality on the coefficients of polynomials expressed in the Bernstein bases and by appealing to a generalized variation diminishing property of Bézier curves. We also derive inequalities between the absolute stability radii of methods with different orders and number of stages.
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Communicated by Antonella Zanna Munthe-Kaas.
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Ait-Haddou, R. New stability results for explicit Runge–Kutta methods. Bit Numer Math 59, 585–612 (2019). https://doi.org/10.1007/s10543-019-00752-9
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DOI: https://doi.org/10.1007/s10543-019-00752-9
Keywords
- Explicit Runge–Kutta methods
- Stability radius
- Polar forms
- Walsh’s coincidence theorem
- Bernstein bases
- Bézier curves