Diagonal sawtooth with expansion factor 4 Population is unbounded but does not tend to infinity. Its graph is a sawtooth function with ever-increasing teeth. A p960 gun sends gliders southwest. Some are deleted; the others reflect off the back of a Cordership. Each returning glider deletes 2 outgoing ones. Note the use of an in-line inverter found by David Bell. This was built by David Bell 8/29/92 (header written by Dean Hickerson)Xref: corder sawtooth