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Abstract We present a multiplicity result of positive solutions for the Neumann problem associated with a second order nonlinear differential equation of the following form u ″ + a ( t ) g ( u ) = 0… (More)

In this paper we focus on the periodic boundary value problem associated with the Liénard differential equation x + f(x)x + g(t, x) = s, where s is a real parameter, f and g are continuous… (More)

Abstract We deal with the Neumann boundary value problem u ′ ′ + ( λ a + ( t ) − μ a − ( t ) ) g ( u ) = 0 , 0 u ( t ) 1 , ∀ t ∈ [ 0 , T ] , u ′ ( 0 ) = u ′ ( T ) = 0 , where the weight term has two… (More)

- Elisa Sovrano
- 2017

We prove an Ambrosetti-Prodi type result for a Neumann problem associated to the equation \begin{document}$u''+f(x, u(x))=μ$\end{document} when the nonlinearity has the following form:… (More)

- Elisa Sovrano
- Journal of mathematical biology
- 2017

We deal with the study of the evolution of the allelic frequencies, at a single locus, for a population distributed continuously over a bounded habitat. We consider evolution which occurs under the… (More)

We present some existence and multiplicity results for positive solutions to the Dirichlet problem associated with

Reaction-diffusion equations have several applications in the field of population dynamics and some of them are characterized by the presence of a factor which describes different types of food… (More)

We deal with the periodic boundary value problem associated with the parameter-dependent second-order nonlinear differential equation \begin{equation*} u'' + cu' + \bigr{(} \lambda a^{+}(x) - \mu… (More)

In 1948 Mario Dolcher proposed an expansive version of the Brouwer xed point theorem for planar maps. In this article we reconsider Dolcher's result in connection with some properties, such as… (More)

Elisa Sovrano and Fabio Zanolin, "Dolcher fixed point theorem and its connections with recent developments on compressive/expansive maps", in: Rendiconti dell’Istituto di Matematica dell’Universita… (More)