Unique father problem: Difference between revisions
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:''Is there a stable configuration whose only father is itself (with some fading junk some distance away not being counted)? | :''Is there a stable configuration whose only father is itself (with some fading junk some distance away not being counted)? | ||
The problem has been answered positively by Ilkka Törmä, with a 26x32 still-life.<ref name="post140258" | The problem has been answered positively by Ilkka Törmä, with a 26x32 still-life.<ref name="post140258" /> | ||
==Also see== | ==Also see== | ||
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|pages = p. 1 | |pages = p. 1 | ||
}}</ref> | }}</ref> | ||
<ref name="post140258">{{LinkForumThread | |||
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|title = Re: Unproven conjectures | |||
|p = 140258 | |||
|author = Ilkka Törmä | |||
|date = January 13, 2022}}</ref> | |||
</references> | |||
Revision as of 23:04, 13 January 2022
| Unique father problem | ||
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| View static image | ||
| Pattern type | Problem | |
|---|---|---|
| Static symmetry | Unspecified | |
| Discovered by | Unknown | |
| Year of discovery | Unknown | |
The unique father problem is the following question, posed by John Conway in 1972 in Lifeline Volume 6 with an associated $50 cash prize,[1] along with the grandfather problem:
- Is there a stable configuration whose only father is itself (with some fading junk some distance away not being counted)?
The problem has been answered positively by Ilkka Törmä, with a 26x32 still-life.[2]
Also see
References
- ↑ Robert Wainwright (October 1972). Lifeline, vol 6, p. 1.
- ↑ Ilkka Törmä (January 13, 2022). Re: Unproven conjectures (discussion thread) at the ConwayLife.com forums