Difference between revisions of "Pi-heptomino"
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'''Pi-heptomino''' (or '''pi''') is a common [[Polyomino#Heptominoes|heptomino]] that stabilizes at [[generation]] 173. The name "pi" is also applied to some slight variations of this object that follow that same evolutionary sequence - in a [[pi ship]], for example, the pi-heptomino itself never actually arises. Forms that are synonymous with the pi-heptomino are displayed below. | '''Pi-heptomino''' (or '''pi''') is a common [[Polyomino#Heptominoes|heptomino]] that stabilizes at [[generation]] 173. The name "pi" is also applied to some slight variations of this object that follow that same evolutionary sequence - in a [[pi ship]], for example, the pi-heptomino itself never actually arises. Forms that are synonymous with the pi-heptomino are displayed below. | ||
In April [[:Category:Patterns found in 1992|1992]], [[Bill Gosper]] discovered that two [[block]]s can be used to [[eater|eat]] a pi, as shown below. The eating reaction takes 65 [[generation]]s to complete. | In April [[:Category:Patterns found in 1992|1992]], [[Bill Gosper]] discovered that two [[block]]s can be used to [[eater|eat]] a pi, as shown below. The eating reaction takes 65 [[generation]]s to complete. Gosper also discovered in the same month that a pi, along with two blocks and two [[blinker]]s, can be used to create a [[queen bee shuttle]]. | ||
==Image gallery== | ==Image gallery== |
Revision as of 23:01, 5 August 2009
Pi-heptomino | |||||||
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Pattern type | Miscellaneous | ||||||
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Number of cells | 7 | ||||||
Bounding box | 3 × 3 | ||||||
Discovered by | Unknown | ||||||
Year of discovery | Unknown | ||||||
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Pi-heptomino (or pi) is a common heptomino that stabilizes at generation 173. The name "pi" is also applied to some slight variations of this object that follow that same evolutionary sequence - in a pi ship, for example, the pi-heptomino itself never actually arises. Forms that are synonymous with the pi-heptomino are displayed below.
In April 1992, Bill Gosper discovered that two blocks can be used to eat a pi, as shown below. The eating reaction takes 65 generations to complete. Gosper also discovered in the same month that a pi, along with two blocks and two blinkers, can be used to create a queen bee shuttle.
Image gallery
See also
External links
- Pi-heptomino at the Life Lexicon