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This is an interesting screensaver for windows. Available in two versions: for windows32 and windows64. It is a nonlinear chaotic multibody simulation. The user is free to change all the parameters. This simulation is getting ever more interesting, with faster machines.

A C++ library to calculate higher order derivatives for one or more independent variables. Only potentially nonzero derivatives are being calculated and stored. Certain operations increase the order of derivatives until the maximum is reached (parameter).