In this paper, we ascertain the global $\lambda$-structure of the set of positive and negative solutions bifurcating from $u=0$ for the semilinear elliptic BVP \begin{ equation*} \left\{ \begin{ array}{ ll} -d\Delta u= \lambda\langle \mathfrak{ a},\nabla u\rangle+u+\lambda u^{ 2}-u^{ q} & \text{ in } \Omega, \\ u=0 & \text{ on } \partial\Omega, \end{ array}\right. \end{ equation*} according to the values of $d>0$ and the integer number $q\geq 4$. Figures 1.1-1.3 summarize the main findings of this paper according to the values of $d$ and $q$. Note that the role played by the parameter $\lambda$ in this model is very special, because, besides measuring the strength of the convection, it quantifies the amplitude of the nonlinear term $\lambda u^2$. We regard to this problem as a mathematical toy to generate solution loops and isolas in Reaction Diffusion equations.
Categories: math.AP