Defining a 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.

> MODEL := diff( %? , %? ) = %? ; # define the differential equation model

> IC := %? = %? ; # specify an initial condition

> VAR := { %? }; # specify the variables in the model

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