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math.AP2019
Extrapolation of the Dirichlet problem for elliptic equations with complex coefficients
Martin Dindoš, Jill Pipher
In this paper, we prove an extrapolation result for complex coefficient divergence form operators that satisfy a strong ellipticity condition known as -{\it ellipticity}. Specif…
math.CA2019
Bi-parameter trilinear Fourier multipliers and pseudo-differential operators with flag symbols
Guozhen Lu, Jill Pipher, Lu Zhang
The main purpose of this paper is to study Hölder type estimates for a bi-parameter trilinear Fourier multiplier with flag singularity, and the analogous pseudo-differential…