Nonlinear Sciences – Pattern Formation and Solitons
Scientific paper
1997-06-10
Nonlinear Sciences
Pattern Formation and Solitons
2 pages, Revtex, no figures
Scientific paper
10.1016/S0375-9601(98)00100-5
We consider the bifurcation problem u'' + \lambda u = N(u) with two point boundary conditions where N(u) is a general nonlinear term which may also depend on the eigenvalue \lambda. A new derivation of a variational principle for the lowest eigenvalue \lambda is given. This derivation makes use only of simple algebraic inequalities and leads directly to a more explicit expression for the eigenvalue than what had been given previously.
Benguria Rafael D.
Depassier Cristina M.
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