this post was submitted on 18 Aug 2023
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Good explanation.
This has the interesting implication that the relative speed between the portals is "added" to whatever goes through it.
Example: the blue portal is on a train running with the same speed in opposite direction. The people-bundle would instantaneously be accelerated to twice the speed of each of the trains. (This becomes a real headscratcher if you were able to put the portals in a particle accelerator)