2 problems

Let $(u,v)$ solve the reaction-diffusion system of allelopathic phytoplankton with fear function $k(x)$, subject to the parameter restrictions … where $\mathbf{k}$ is either…

Consider the general predator-pest model … where $x$ is the pest population, $y$ is the predator population, $\xi$ is the quantity of additional food, and $f$ is a pest-dependent f…