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the A - B collision vanishes

Figure 3.2: A and B gliders, travelling in opposite directions, can collide. They leave no trace of their former existence.
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A and B gliders, along with their polymers, induce simple fault lines in the ether lattice along which the ether is displaced vertically by two cells but with relative offsets which run in opposite diredtions. So collisions just balance the offsets, leaving the difference as the overall result. An A polymer colliding with a B polymer of equal weight leaves no trace; otherwise the higher polymer continues its course, appropriately diminished.

Jose Manuel Gomez Soto 2002-01-31