1) "Diffussion" is species vs time equals species spatial laplacian.
2) The "reaction" equations are non-painfully derived from Baez stochastic Petri nets/chemical reaction networks in [1] (species vs time = multivariate polynomial in species, "space dependant rate equation")
So Reaction-Diffusion is just adding up. Species vs time = species spatial laplacian plus multivariate polynomial in species. One more for the toolbox!
1) "Diffussion" is species vs time equals species spatial laplacian.
2) The "reaction" equations are non-painfully derived from Baez stochastic Petri nets/chemical reaction networks in [1] (species vs time = multivariate polynomial in species, "space dependant rate equation")
So Reaction-Diffusion is just adding up. Species vs time = species spatial laplacian plus multivariate polynomial in species. One more for the toolbox!
[1] https://arxiv.org/abs/1209.3632