This is a time-reversible continuous Level model of the System Dynamics methodology.

Given the following state-space model:

der(x) = f(x,t);

Time reversal can be achieved by placing a minus sign in front of each state equation:

der(x) = -f(x,t);

The Reverse_Level model contains a modulating variable dir that determines the direction of time flow:

der(x) = dir*f(x,t);

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