Abstract
For a specific elliptic boundary value problem with quadratic nonlinearity, we give a partial positive answer to an old conjecture concerning the number of solutions. This result is obtained via an existence and enclosure method. For computing the highly accurate solutions needed for this method, a spectral two-grid procedure (combined with a numerical Mountain-Pass algorithm and a Newton iteration) is proposed. Furthermore, Emden’s equation is shown to admit completely spurious approximate solutions which nevertheless have “small” defects—a powerful argument for rigorous enclosure methods.
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Breuer, B., Plum, M., McKenna, P.J. (2001). Inclusions and Existence Proofs for Solutions of a Nonlinear Boundary Value Problem by Spectral Numerical Methods. In: Alefeld, G., Chen, X. (eds) Topics in Numerical Analysis. Computing Supplementa, vol 15. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6217-0_6
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DOI: https://doi.org/10.1007/978-3-7091-6217-0_6
Publisher Name: Springer, Vienna
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