<p>We provide quantitative improvements to the Berezin-Li-Yau inequality and the Kröger inequality, in ℝ<sup><i>n</i></sup>, <i>n</i> ⩾ 2. The improvement on the Kröger inequality resolves an open question raised by Weidl from 2006. The improvements allow us to show that for any open bounded domains, there are infinitely many Dirichlet eigenvalues satisfying Pólya’s conjecture if <i>n</i> ⩾ 3, and infinitely many Neumann eigenvalues satisfying Pólya’s conjecture if <i>n</i> ⩾ 5 and the Neumann spectrum is discrete.</p>

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The improved Berezin-Li-Yau inequality and Kröger inequality and consequences

  • Zaihui Gan,
  • Renjin Jiang,
  • Fanghua Lin

摘要

We provide quantitative improvements to the Berezin-Li-Yau inequality and the Kröger inequality, in ℝn, n ⩾ 2. The improvement on the Kröger inequality resolves an open question raised by Weidl from 2006. The improvements allow us to show that for any open bounded domains, there are infinitely many Dirichlet eigenvalues satisfying Pólya’s conjecture if n ⩾ 3, and infinitely many Neumann eigenvalues satisfying Pólya’s conjecture if n ⩾ 5 and the Neumann spectrum is discrete.