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• W3102098187 abstract "We consider elliptic differential operators on either the entire Euclidean space $mathbb{R}^d$ or on subsets consisting of a cube $Lambda_L$ of integer length $L$. For eigenfunctions of the operator, and more general solutions of elliptic differential quations, we derive several quantitative unique continuation results. The first result is of local nature and estimates the vanishing order of a solution. The second is a sampling result and compares the $L^2$-norm of a solution over a union of equidistributed $delta$-balls in space with the $L^2$-norm on the entire space. In the case where the space $mathbb{R}^d$ is replaced by a finite cube $Lambda_L$ we derive similar estimates. A particular feature of our bound is that they are uniform as long as the coefficients of the operator are chosen from an appropriate ensemble, they are quantitative and explicit with respect to the radius $delta$, they are $L$-independent and stable under small shifts of the $delta$-balls. Our proof applies to second order terms which have slowly varying coefficients on the relevant length scale. The results can be also interpreted as special cases of uncertainty relations, observability estimates, or spectral inequalities." @default.
• W3102098187 created "2020-11-23" @default.
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• W3102098187 date "2017-12-01" @default.
• W3102098187 modified "2023-09-27" @default.
• W3102098187 title "Scale-free quantitative unique continuation and equidistribution estimates for solutions of elliptic differential equations" @default.
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• W3102098187 doi "https://doi.org/10.1063/1.5017938" @default.
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