### A note on a paper of H. Alzer and S. Koumandos.

Wang, Kunyang (2006)

JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]

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Wang, Kunyang (2006)

JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]

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Harris, B.J., Marzano, F. (1999)

Electronic Journal of Qualitative Theory of Differential Equations [electronic only]

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Vladimir I. Rukasov, Olga G. Rovenska (2009)

Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica

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We investigate approximation properties of de la Vallee Poussin right-angled sums on the classes of periodic functions of several variables with a high smoothness. We obtain integral presentations of deviations of de la Vallee Poussin sums on the classes ${C}_{\beta ,\infty}^{m\alpha}$.

Balasubramanian, R., Ponnusamy, S. (1996)

Bulletin of the Belgian Mathematical Society - Simon Stevin

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Acosta, Antonio, Lizana, Marcos (2005)

Divulgaciones Matemáticas

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Wituła, Roman, Słota, Damian (2007)

Journal of Integer Sequences [electronic only]

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Amster, P., de Nápoli, P., Mariani, M.C. (2005)

Portugaliae Mathematica. Nova Série

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Michal Fečkan (1998)

Archivum Mathematicum

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Chaos generated by the existence of Smale horseshoe is the well-known phenomenon in the theory of dynamical systems. The Poincaré-Andronov-Melnikov periodic and subharmonic bifurcations are also classical results in this theory. The purpose of this note is to extend those results to ordinary differential equations with multivalued perturbations. We present several examples based on our recent achievements in this direction. Singularly perturbed problems are studied as well. Applications...

Lenci, Stefano, Rega, Giuseppe (2004)

Mathematical Problems in Engineering

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