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- W2964134857 abstract "This paper studies connections among observable sets, the observability inequality, the Hölder-type interpolation inequality and the spectral inequality for the heat equation in Rn. We present the characteristic of observable sets for the heat equation. In more detail, we show that a measurable set in Rn satisfies the observability inequality if and only if it is γ-thick at scale L for some γ>0 and L>0. We also build up the equivalence among the above-mentioned three inequalities. More precisely, we obtain that if a measurable set in Rn satisfies one of these inequalities, then it satisfies others. Finally, we get some weak observability inequalities and weak interpolation inequalities where observations are made over a ball. Cet article étudie les liens entre les ensembles observables, l'inégalité d'observabilité, l'inégalité d'interpolation de Hölder-type et l'inégalité spectrale pour l'équation de la chaleur dans Rn. Nous présentons la caractéristique des ensembles observables pour l'équation de la chaleur. Plus en détail, nous montrons qu'un ensemble mesurable dans Rn satisfait l'inégalité d'observabilité si et seulement s'il est γ-épais à l'échelle L pour certains γ>0 et L>0. Nous construisons également l'équivalence entre les trois inégalités mentionnées au-dessus. Plus précisément, on obtient que si un ensemble mesurable dans Rn satisfait une de ces inégalités, alors il satisfait les autres. Enfin, nous obtenons des inégalités d'observabilité faibles et des inégalités d'interpolation faibles dans lesquelles les observations sont effectuées sur une boule." @default.
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- W2964134857 date "2019-06-01" @default.
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- W2964134857 title "Observable set, observability, interpolation inequality and spectral inequality for the heat equation in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si1.gif overflow=scroll><mml:msup><mml:mrow><mml:mi mathvariant=double-struck>R</mml:mi></mml:mrow><mml:mrow><mml:mi>n</mml:mi></mml:mrow></mml:msup></mml:math>" @default.
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- W2964134857 doi "https://doi.org/10.1016/j.matpur.2019.04.009" @default.
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