1. The problem statement, all variables and given/known data 6 1st order, nonlinear PDEs in one space and one time variable. 6 variables are function of space and time: a, b, c, d, e f 2. The attempt at a solution Method of lines - Discretize in space. Turns system of PDEs into a much larger system of ODEs. The time term remains untouched (not discretized). Solve the ODEs using Matlab solver, ode15s. 3. Roadblock Two of the equations do not have time-dependent derivatives in them. How do I enforce this?