The numerical method used in the vortex simulation.

For numerical method the applet uses the old standby, the classical fourth-order Runga-Kutta scheme. For details, see any textbook on numeral solution of ODEs.

The timestep used is equal to the frame rate, which by default is once every 60 milliseconds; i.e., the default timestep is 0.06. This can be changed by setting the "frameInterval" parameter inside the applet tag, in case anyone feels like tinkering.

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