Bilinear multipliers with convex-curve epigraphs are bounded in the local L^2 range via staircase paraproduct estimates.
A sharp H\"{o}rmander condition for bilinear Fourier multipliers with Lipschitz singularities
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abstract
This paper studies the $L^{p}$ boundedness of bilinear Fourier multipliers in the local $L^{2}$ range. We assume a H\"{o}rmander condition relative to a singular set that is a finite union of Lipschitz curves. The H\"{o}rmander condition is sharp with respect to the Sobolev exponent. Our setup generalizes the non-degenerate bilinear Hilbert transform but avoids issues of uniform bounds near degeneracy.
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A note on bilinear multipliers with convex singularities
Bilinear multipliers with convex-curve epigraphs are bounded in the local L^2 range via staircase paraproduct estimates.