Eater bridge eater
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| Pattern type | Strict still life | ||||||||
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| Number of cells | 14 | ||||||||
| Bounding box | 8 × 5 | ||||||||
| Frequency class | 27.9 | ||||||||
| Static symmetry | n (C1) | ||||||||
| Discovered by | Unknown | ||||||||
| Year of discovery | Unknown | ||||||||
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Eater bridge eater is a 14-cell still life composed of two diagonally-touching eater 1s.
Eater bridge eater is the 81st most common 14-cell still life out of 619.
Applications
This still life is commonly used as a catalyst in oscillators and signal circuitry when two eaters are needed to be placed nearby. In the F116, Speed Tunnel, F176 and Fx176 conduits, its two component eaters have standard eating functions.
In the p23 honey farm hassler, Roseluck, HLx185B, Bronco, NW-2T16 and the Spartan version of 135-degree MWSS-to-G, the catalytic site is on the opposite side of the object, and the slightly smaller eater bridge snake can be used instead. See Tutorials/Catalyses for descriptions on how the still life acts as a replacement catalyst for a block or a ship.
In the p8 glider reflector and 30P6.1, the eater bridge eater is used similarly to a grin reagent, where it reacts with the grin to create another grin in 4 generations. However this application has few known uses due to its low recovery time causing it to react with the grin if it is turned again, preventing a smaller version of 128P12. It also has no drifter, so it cannot be used to create a LCM oscillator by welding it with loading dock.
Naming
A more precise name for this still life is Mark Niemiec's Eater tail bridge behind eater tail. This is too long and technical to find its way into common usage, but it correctly distinguishes this object from related still lifes such as eater tail bridge eater tail, eater head tie up eater head, eater head tie down eater head, eater head bridge eater tail, and eater head behind eater.
Eater tie eater and welded eaters have also been used to refer to this still life on occasion, but both of these terms are technically incorrect. A weld implies an overlap between welded objects, and a tie is a point-to-point connection along the lines of a boat-tie. The name eater tie eater has been in use for many years in Mark Niemiec's database, referring to a different object that is also named as valentine.
Construction
All strict still lifes with a population of 23 or fewer cells, all oscillators with 16 or fewer cells, and all spaceships with 35 or fewer cells are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.
In the case of the MWSS-to-G, there are known recipes that allow the eater-bridge-eater variant to be constructed with slow salvos in any orientation, so this variant is more commonly used.
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Catalyses
(click above to open LifeViewer)
The eater bridge eater can serve as a catalyst, as shown to the right. Most of these catalyses involve the eater bridge eater being turned into an "activated form", which then interacts with the active region in a way that turns it back into an eater bridge eater.
Hassling
The "activated form" mentioned above has several ways in which it can be rejuvenated. This allows the eater bridge eater to be hassled at periods three through seven.
| Hassling at period three by moose antlers, found by James Pascua based on a reaction found by Daniel Vargas[6] (click above to open LifeViewer) Catagolue: here |
| Hassling at period three by a bespoke variant of two eaters, found by Caleb R. Hilton based on a reaction found by Daniel Vargas[7] (click above to open LifeViewer) Catagolue: here |
| Double hassling at period four by a modified barberpole, found by LuveelVoom on April 5, 2025[8] (click above to open LifeViewer) Catagolue: here |
| Hassling at period four by a lightweight emulator (click above to open LifeViewer) Catagolue: here |
| A larger version of hooks demonstrating hassling at period five (click above to open LifeViewer) Catagolue: here |
| Hassling at period five by a period-five sustained dot sparker (click above to open LifeViewer) Catagolue: here |
| A larger version of 30P6.1 demonstrating hassling at period six (click above to open LifeViewer) Catagolue: here |
| Hassling at period six by an eater 2 and a p6 domino fountain (click above to open LifeViewer) Catagolue: here |
| A larger version of 28P7.2 demonstrating hassling at period seven (click above to open LifeViewer) Catagolue: here |
References
- ↑ xs14_354cgs26 at Adam P. Goucher's Catagolue
- ↑ chris_c (February 21, 2015). Re: The Hunting of the New Herschel Conduits (discussion thread) at the ConwayLife.com forums
- ↑ chris_c (April 13, 2015). Re: Slow salvo seeds (discussion thread) at the ConwayLife.com forums
- ↑ 4.0 4.1 The 619 fourteen-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 14/14-172.rle)
- ↑ Entity Valkyrie 2 (March 27, 2021). Re: Thread for your unusual catalyses (discussion thread) at the ConwayLife.com forums
- ↑ James Pascua (February 12, 2025). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Caleb R. Hilton (February 12, 2025). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ luveelvoom (April 5, 2025). Message in #cgol on the Conwaylife Lounge Discord server
External links
- Eater bridge eater at Adam P. Goucher's Catagolue
- The 619 fourteen-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 14/14-172.rle)