Lower bounds for Schrödinger equations Charles Fefferman, D. H. Phong (1982) Journées équations aux dérivées partielles
Lower bounds for Schrödinger operators in H¹(ℝ) Ronan Pouliquen (1999) Studia Mathematica We prove trace inequalities of type | | u ' | | L 2 2 + ∑ j ∈ ℤ k j | u ( a j ) | 2 ≥ λ | | u | | L 2 2 where u ∈ H 1 ( ℝ ) , under suitable hypotheses on the sequences a j j ∈ ℤ and k j j ∈ ℤ , with the first sequence increasing and the second bounded.
Lower bounds for the infimum of the spectrum of the Schrödinger operator in ℝ N and the Sobolev inequalities. Veling, E. J. M. (2002) JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]