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Remarks on estimates for the adjoint restriction operator to curves over the sphere

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arxiv 1810.08081 v2 pith:TI5DCKCU submitted 2018-10-18 math.CA

Remarks on estimates for the adjoint restriction operator to curves over the sphere

classification math.CA
keywords estimatesmeasuresadjointcurvesexampleoperatorrestrictionsphere
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Recently, two of the authors obtained estimates for the adjoint restriction operator to finite type curves with respect to general measures. Strikingly, it turns out that some of such estimates are sharp, especially when the measures are given by surface measures under certain condition. A typical example is the surface measure on the sphere. We demonstrate sharpness of such estimates by constructing an example and, also, discuss related estimates over different type of surfaces.

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