Abstract
We study smoothing properties and approximation of time derivatives for time discretization schemes with variable time steps for a homogeneous parabolic problem formulated as an abstract initial value problem in a Banach space. The time stepping methods are based on using rational approximations to the exponential function which are A(Θ)-stable for suitable Θ∈(0,π/2] with unit bounded maximum norm. First- and second-order approximations of time derivatives based on using difference quotients are considered. Smoothing properties are derived and error estimates are established under the so-called increasing quasi-quasiuniform assumption on the time steps.
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Yan, Y. Smoothing Properties and Approximation of Time Derivatives for Parabolic Equations: Variable Time Steps. BIT Numerical Mathematics 43, 647–669 (2003). https://doi.org/10.1023/B:BITN.0000007061.40742.4e
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DOI: https://doi.org/10.1023/B:BITN.0000007061.40742.4e