SYSML — figure C2

In figure C2, subactivity Add requires two inputs, u(t) and -2x(t). While the logic makes sense, I don’t believe the activity diagram should ever start running, because the 2nd pin is never supplied with data until the Add runs.

It’s difficult to see how this could be fixed, for example, making the 2nd pin optional will allow the Adder to work when the Multiplier hasn’t finished, which is not correct.

So we only want this to be optional the first time.

In any case, a fix is needed.

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