Periodic solution of a bioeconomic fishery model by coincidence degree theory Page 1
Electronic Journal of Qualitative Theory of Differential Equations 2023, No. 29, 1–12; https://doi.org/10.14232/ejqtde.2023.1.29 …

In this paper, we use Leggett-Williams multiple fixed point theorems to obtain sufficient
conditions for the existence of at least one or two positive radial solutions of the equation−∆ …

In this paper, sufficient conditions are given for the existence of at least three positive T-
periodic solutions of the Nicholson's Blowflies model with a harvesting term x (t)=− a (t) x (t)+ …

We consider the existence of at least three positive solutions of a nonlinear first order
problem with a nonlinear nonlocal boundary condition given by [formula] where r:[0 …

INTERNATIONAL PUBLICATIONS (USA) Page 1 INTERNATIONAL PUBLICATIONS (USA)
PanAmerican Mathematical Journal Volume 23(2013), Number 1, 45–55 Existence and …

Memoirs on Differential Equations and Mathematical Physics POSITIVE PERIODIC
SOLUTIONS FOR A NONLINEAR FUNCTIONAL DIFFERENTIAL E Page 1 Memoirs on …

Communications in Applied Analysis 17 (2013), no. 3 & 4, 319–330 MULTIPLE POSITIVE
PERIODIC SOLUTIONS OF FIRST ORDER ORDIN Page 1 Communications in Applied Analysis …

In this article we study the existence and uniqueness of positive periodic solutions of the
following bioeconomic model in fishery dymanics... where the functions r, q, A, c and-are …

In this chapter, by using a fixed point theorem in cones in a Banach space, we present
different sufficient conditions for the existence of at least two positive periodic solutions of …

The existence of two positive periodic solutions of first order functional differential equations
with nondecreasing nonlinear terms is proved. The results are applied to the logistic …