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math.GN2015
A note on a fixed point theorem on topological cylinders
Guglielmo Feltrin
We present a fixed point theorem on topological cylinders in normed linear spaces for maps satisfying a property of stretching a space along paths. This result is a generalization…
math.CA2015
Pairs of positive periodic solutions of nonlinear ODEs with indefinite weight: a topological degree approach for the super-sublinear case
Alberto Boscaggin, Guglielmo Feltrin, Fabio Zanolin
We study the periodic and the Neumann boundary value problems associated with the second order nonlinear differential equation \begin{equation*} u'' + c u' + λa(t) g(u) = 0, \end{e…
math.CA2015
Existence of positive solutions of a superlinear boundary value problem with indefinite weight
Guglielmo Feltrin
We deal with the existence of positive solutions for a two-point boundary value problem associated with the nonlinear second order equation . The weight is a…