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  • On p-elliptic divergence fo...
    Egert, Moritz

    Journal of evolution equations, 09/2020, Volume: 20, Issue: 3
    Journal Article

    Second-order divergence form operators are studied on an open set with various boundary conditions. It is shown that the p -ellipticity condition of Carbonaro–Dragičević and Dindoš–Pipher implies extrapolation to a holomorphic semigroup on Lebesgue spaces in a p -dependent range of exponents that extends the maximal range for general strictly elliptic coefficients. This has immediate consequences for the harmonic analysis of such operators, including H ∞ -calculi and Riesz transforms.