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On a modified Hilbert transformation, the discrete inf-sup condition, and error estimates (2402.08291v1)
Published 13 Feb 2024 in math.NA and cs.NA
Abstract: In this paper, we analyze the discrete inf-sup condition and related error estimates for a modified Hilbert transformation as used in the space-time discretization of time-dependent partial differential equations. It turns out that the stability constant depends linearly on the finite element mesh parameter, but in most cases, we can show optimal convergence. We present a series of numerical experiments which illustrate the theoretical findings.