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MR942630
(89f:81028)
81C05
(34B25)
Ashbaugh, Mark S.; Benguria, Rafael Optimal lower bound for the gap between the first two eigenvalues of one-dimensional Schrödinger operators with symmetric single-well potentials. Proc. Amer. Math. Soc. 105 (1989), no. 2, 419--424. |
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