title: Direct and inverse relationships between Riccati systems coupled with multiplicative terms.
abstract: An analytical and computational framework for the derivation of solitary solutions to biological systems describing the cooperation and competition of species and expressed by the system of Riccati equations coupled with multiplicative terms is presented in this paper. It is demonstrated that relationships between these solitary solutions can be either direct or inverse. Thus, an infinitesimal perturbation of one population would lead to an infinitesimal change in the other population - if only both solitary solutions are coupled with the direct relationship. But, in general, that is not true if solitary solutions are coupled with the inverse relationship - an infinitesimal perturbation of one population may result into a non-infinitesimal change in the other population. Necessary and sufficient conditions for the existence of solitary solutions are derived in the space of the system's parameters and initial conditions.
authors.affiliation: a Department of Mathematical Modeling , Kaunas University of Technology , Kaunas , Lithuania.
authors.forename: Z
authors.initials: Z
authors.lastname: Navickas
authors.affiliation: b Department of Mathematics , Lithuanian University of Educational Sciences , Vilnius , Lithuania.
authors.forename: R
authors.initials: R
authors.lastname: Vilkas
authors.affiliation: c Research Group for Mathematical and Numerical Analysis of Dynamical Systems , Kaunas University of Technology , Kaunas , Lithuania.
authors.forename: T
authors.initials: T
authors.lastname: Telksnys
authors.affiliation: c Research Group for Mathematical and Numerical Analysis of Dynamical Systems , Kaunas University of Technology , Kaunas , Lithuania.
authors.forename: M
authors.initials: M
authors.lastname: Ragulskis
mesh_terms: D019295:Computational Biology; D008962:Models, Theoretical
keywords: 34A05; 34A34; 34L30; Riccati equation; Solitary solution; existence; multiplicative coupling