### Comparison of two definitions of lower and upper functions associated to nonlinear second order differential equations.

Vrkoč, Ivo (2001)

Journal of Inequalities and Applications [electronic only]

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Vrkoč, Ivo (2001)

Journal of Inequalities and Applications [electronic only]

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Rachůnková, Irena

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Martin Šenkyřík (1994)

Mathematica Bohemica

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In the paper we prove an Ambrosetti-Prodi type result for solutions $u$ of the third-order nonlinear differential equation, satisfying ${u}^{\text{'}}\left(0\right)={u}^{\text{'}}\left(1\right)=u\left(\eta \right)=0,\phantom{\rule{4pt}{0ex}}0\le \eta \le 1$.

Ján Rusnák (1990)

Mathematica Slovaca

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Valter Šeda (1989)

Archivum Mathematicum

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Dhage, B.C., Heikkilä, S. (1993)

Journal of Applied Mathematics and Stochastic Analysis

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