Negative Eigenvalues of Two-Dimensional Schrödinger Operators

@article{Grigoryan2011NegativeEO,
  title={Negative Eigenvalues of Two-Dimensional Schr{\"o}dinger Operators},
  author={Alexander Grigor’yan and Nikolai S. Nadirashvili},
  journal={Archive for Rational Mechanics and Analysis},
  year={2011},
  volume={217},
  pages={975-1028}
}
We prove a certain upper bound for the number of negative eigenvalues of the Schrödinger operator H = −Δ − V in $${\mathbb{R}^{2}.}$$R2. 
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