In an $$n$$ -dimensional bounded domain $$\Omega_n$$ , $$n\ge 2$$ , we prove the Steklov–Poincare inequality with the best constant in the case where $$\Omega_n$$ is an $$n$$ -dimensional ball.… Click to show full abstract
In an $$n$$ -dimensional bounded domain $$\Omega_n$$ , $$n\ge 2$$ , we prove the Steklov–Poincare inequality with the best constant in the case where $$\Omega_n$$ is an $$n$$ -dimensional ball. We also consider the case of an unbounded domain with finite measure, in which the Steklov–Poincare inequality is proved on the basis of a Sobolev inequality.
               
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