Integrable systems via inverse integrating factor.
J. Chavarriga, J. Giné (1998)
Extracta Mathematicae
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J. Chavarriga, J. Giné (1998)
Extracta Mathematicae
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M. S. A. C. Castilla, Vinicio Moauro, Piero Negrini, Waldyr Muniz Oliva (1993)
Annales de l'I.H.P. Physique théorique
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Shibata, Tetsutaro (2009)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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Lorenza Diomeda, Benedetta Lisena (1987)
Rendiconti del Seminario Matematico della Università di Padova
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Ryszard Szwarc (1998)
Colloquium Mathematicae
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Harper’s operator is defined on by where . We show that the norm of is less than or equal to for . This solves a conjecture stated in [1]. A general formula for estimating the norm of self-adjoint tridiagonal infinite matrices is also derived.
Ľudmila Zajacová (1986)
Mathematica Slovaca
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