On the strict monotonicity of the first eigenvalue of the 𝑝-Laplacian on annuli

@article{Anoop2018OnTS,
  title={On the strict monotonicity of the first eigenvalue of the 𝑝-Laplacian on annuli},
  author={T. V. Anoop and Vladimir Bobkov and Sarath Sasi},
  journal={Transactions of the American Mathematical Society},
  year={2018}
}
<p>Let <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper B 1"> <mml:semantics> <mml:msub> <mml:mi>B</mml:mi> <mml:mn>1</mml:mn> </mml:msub> <mml:annotation encoding="application/x-tex">B_1</mml:annotation> </mml:semantics> </mml:math> </inline-formula> be a ball in <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="double-struck upper R… 

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