Abstract
We show that for a class of one-dimensional linear elliptic fourth-order equations with homogeneous Dirichlet boundary conditions, a non-positive and non-vanishing right-hand side gives rise to a negative solution. We obtain a similar result for the same class of equations for radially symmetric solutions in a ball or in an annulus. We then give several applications, including applications to non-linear equations and eigenvalue problems.
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The work of Ph. L. was partially supported by the Centre International de Mathématiques et d’Informatique CIMI, Toulouse.
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Laurençot, P., Walker, C. Sign-preserving property for some fourth-order elliptic operators in one dimension or in radial symmetry. JAMA 127, 69–89 (2015). https://doi.org/10.1007/s11854-015-0024-2
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DOI: https://doi.org/10.1007/s11854-015-0024-2