Orthogonal sawtooth with expansion factor 21 Population is unbounded but does not tend to infinity. Its graph is a sawtooth function with ever-increasing teeth. More specifically, the population in generation t = 18*21^n + 222 (n>=0), is 7t/60 + 1290, but the population in generation 6*21^n + 193 (n>=1) is only 1212. This uses a spark from a c/3 orthogonal spaceship ("turtle") to turn a HWSS into a loaf, which is then pulled back by pairs of LWSSs. When the loaf is pulled all the way back, another HWSS is fired toward the c/3, starting the cycle again. The HWSS synthesis, using 2 gliders, a Kok's galaxy, and a figure 8, is due to David Buckingham. This was the first sawtooth built. Dean Hickerson, dean@ucdmath.ucdavis.edu 4/10/91Xref: sawtooth

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