Diuresis

Diuresis
x = 38, y = 21, rule = B3/S23 2bo4bo22bo4bo$2ob4ob2o18b2ob4ob2o$2bo4bo22bo4bo2$15b2o$15bob2o$18bo$16b 3o6$16b3o$18bo$15bob2o$15b2o2$2bo4bo22bo4bo$2ob4ob2o18b2ob4ob2o$2bo4b o22bo4bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 2 ZOOM 10 GPS 10 LOOP 90 ]]
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Pattern type	Oscillator
Oscillator type	Shuttle
Number of cells	66
Bounding box	44 × 27
Period	90 (mod: 45)
Heat	121.51
Volatility	1.00 | 0.42
Kinetic symmetry	-c+e
Discovered by	David Eppstein
Year of discovery	1998
Rules Outer-totalistic rules B3/S23 only # of rules 20 = 1 Isotropic rules B3/S23 – B3/S235e6ei
Glider synthesis Fewest gliders 18† Catagolue-generated RLE synthesis Uploaded synthesis RLE diuresis_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext diuresis.cells RLE diuresis.rle
Identifiers apgcode xp90_4r4yb4r4z4r4yb4r4zzy03d8ey1e8d3zz0oydoz1u1yb1u1z161yb161

Diuresis is a period-90 oscillator consisting of two bookends being hassled by oscillators or stable catalysts. The original oscillator was found by David Eppstein on October 11, 1998, and was hassled by pentadecathlons. With a minimum population of 66 cells, this is still the smallest known form of the oscillator in terms of cell count. Later that same day, Dean Hickerson replaced the pentadecathlons with the still life arrangement. The form below shows two still life arrangements, one with the minimal population (left) and one with the minimal bounding box (right).

The name is due to Bill Gosper, who compared the bookends to kidneys.

The combination of bookends in this oscillator reappear 45 generations later if two intermediate boats are removed. Therefore, there are many options to the sparkers and catalysts supporting this oscillator.

x = 29, y = 25, rule = B3/S23 5b2o16b2o$6bo16bo$6bobo12bobo$7b2o12b2o2$4b2o18b2o$4bobo10b2o4bobo$5bo 10bobo5bo$2bo13b2o9bo$2b6o8bo5b6o$7bo14bo$4b2o18b2o$4bo20bo$5bo18bo$2b 3o2bo14bo2b3o$2bo2b3o8bo5b3o3bo$3bo12b2o7b3o$4b2o10bobo5bo$6bo10b2o4bo 2b2o$4b2o18b2obo$bo2bo20bo$obobo2b2o12b2o2bo$bo2bobobo12bobob2o$4bobo 16bo2bo$5b2o16b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ WIDTH 600 HEIGHT 600 THUMBSIZE 2 ZOOM 16 GPS 15 AUTOSTART LOOP 90 ]]

Diuresis supported by stable catalysts (click above to open LifeViewer) RLE: here Plaintext: here Catagolue: here

External links

• Diuresis at the Life Lexicon
• Diuresis at Adam P. Goucher's Catagolue
• Diuresis w/ stable catalysts at Adam P. Goucher's Catagolue
• Diuresis at Wikipedia (name origin)