‘stable diffusion model with a constant transport rate $D$ and a

‘stable diffusion model with a constant transport rate $D$ and a constant ‘ ‘rate of growth $r$. The model has a steady state solution $\bar{y}_0 = y_0$ ‘ ‘such that $$\label{steady}n’ ‘\bar{y}_0 = \frac{1}{D} \int_{0}^’