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<p>We consider the torsional rigidity and the principal eigenvalue related to the Laplace operator with Dirichlet and Robin boundary conditions. The goal is to find upper and lower bounds to products of suitable powers of the quantities above in the class of Lipschitz domains. The threshold exponent for the Robin case is explicitly recovered and shown to be strictly smaller than in the Dirichlet one.</p>

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Relations Between Principal Eigenvalue and Torsional Rigidity with Robin Boundary Conditions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月1日

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  • Giuseppe Buttazzo,
  • Simone Cito,
  • Francesco Solombrino

摘要

We consider the torsional rigidity and the principal eigenvalue related to the Laplace operator with Dirichlet and Robin boundary conditions. The goal is to find upper and lower bounds to products of suitable powers of the quantities above in the class of Lipschitz domains. The threshold exponent for the Robin case is explicitly recovered and shown to be strictly smaller than in the Dirichlet one.