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arXiv · 2611.00835

The Two-Point Inequality for $p>q$

Di Wu
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Abstract

For $1<q<p<\infty$ we study the $L^p\to L^q$ contractivity of the two-point operator $T_ω(a+bx)=a+ωbx$ with a complex parameter $ω$, extending the Weissler two-point condition, usually discussed in the range $1<p\le q<\infty$, to the reversed order of exponents. For $1<q<p<2$ we prove that the second-order necessary condition $|(p-2)-(q-2)ω^2|\le p-q|ω|^2$, obtained near $(a,b)=(1,0)$, is also sufficient; by duality the same description applies to $2<q<p<\infty$. The proof uses the method of characteristic flows. In addition, for $q\le2\le p$ the contractivity follows directly from $L^2$ contraction.

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Di Wu. 2026-10-31. The Two-Point Inequality for $p>q$. https://arxiv.org/abs/2611.00835

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