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2018
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In this paper we prove that the first s-number of the Cauchy-Dirichlet heat operator is minimized in a circular cylinder among all Euclidean cylindric domains of a given measure. It is an analogue of the Rayleigh-Faber-Krahn inequality for the heat operator. We also prove a Hong-Krahn-Szeg? and a Payne-P?lya-Weinberger type inequalities for the Cauchy-Dirichlet heat operator.