Suppose we have a rigid token-ring network. An observer at any node can seemingly determine the angular momentum of the network by measuring the time it takes for a packet to travel around the ring in each of the two directions. Is it possible by any means for an observer to determine whether the network is knotted?
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Actually, an observer can't measure even the angular momentum. For example, suppose the token ring is in the form of a figure 8. Then the times around the two directions are identical even if the token ring is rotating.
Carl Brannen
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Measure electric field. This gives you position of electron. And complete topology of wire.
TROLLHUNTER
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