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We study positive solutions to steady-state reaction–diffusion models of the form { − Δ u = λ f ( v ) ; Ω , − Δ v = λ g ( u ) ; Ω , ∂ u ∂ η + λ u = 0 ; ∂ Ω , ∂ v ∂ η + λ v = 0 ; ∂ Ω , $$ \textstyle\begin{cases} -\Delta u=\lambda f(v);\quad\Omega, \\ -\Delta v=\lambda g(u);\quad\Omega, \\ \frac{\partial u}{\partial \eta }+\sqrt{\lambda } u=0;\quad \partial \Omega, \\ \frac{\partial v}{\partial \eta }+\sqrt{\lambda }v=0; \quad\partial \Omega, \end{cases} $$ where λ > 0 $\lambda >0$ is a positive parameter, Ω is a bounded domain in R N $\mathbb{R}^{N}$ ( N > 1 ) $(N > 1)$ with smooth boundary ∂ Ω, or Ω = ( 0 , 1 ) $\Omega =(0,1)$ , ∂ z ∂ η $\frac{\partial z}{\partial \eta }$ is the outward normal derivative of z . We assume that f and g are continuous increasing functions such that f ( 0 ) = 0 = g ( 0 ) $f(0) = 0 = g(0)$ and lim s → ∞ f ( M g ( s ) ) s = 0 $\lim_{s \rightarrow \infty } \frac{f(Mg(s))}{s} = 0$ for all M > 0 $M>0$ . In particular, we extend the results for the single equation case discussed in (Fonseka et al. in J. Math. Anal. Appl. 476(2):480-494, 2019 ) to the above system.

Analysis of reaction–diffusion systems where a parameter influences both the reaction terms as well as the boundary