Defines the derivative function F(x, y) for ODE problems.
An ordinary differential equation (ODE) is an equation in which there is only one independent variable and one or more derivatives of a dependent variable with respect to the independent variable, so that all the derivatives occurring in the equation are ordinary derivatives.
A first order ordinary differential equation (ODE) initial value problem (IVP) takes the following form.
Some ODE solvers require the second derivative for more accurate Taylor series approximation.
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