Defining the model
All differential equation models begin with a differential equation. If the problem is an intial value problem, an initial condition is also needed. Replace the question marks ( ? ) in the following input regions to define the relevant ODE model.
> ode1 := diff( ?, ? ) = ? ;
> ode2 := diff( ?, ? ) = ? ;
> MODEL := { ode1, ode2 } ; # define the differential equation model
> VAR := { ?, ? } ; # identify the variables in the model
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