# classification of PDEs

## What type of PDEs (partial differential equations) are the following:

1. $\frac{\mu}{K}\textbf{u} + \frac{\partial \textbf{u}}{\partial t} = -\nabla p$ (Darcy's law),
2. $\frac{\partial c} {\partial t} + \textbf{u} \cdot \nabla c= \nabla^2 c$ (convection-diffusion equation).

Next how many boundary conditions and initial conditions does a PDE require to solve $?$ for example