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[b]:sparse Life[/b] ... but it is not at all clear that there is any mechanism for these to deal with _the all_ junk produced by switch engines.
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[b]:sparse Life[/b] ... but it is not at all clear that there is any mechanism for these to deal with _the all_ junk produced by switch engines.
Thanks --- fixed. (And also updated the "reverse caber tosser" entry to reflect the fact that the best lower bound is now 58, rather than 59.)wildmyron wrote:Noticed this in a quote on the forum -
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[b]:sparse Life[/b] ... but it is not at all clear that there is any mechanism for these to deal with _the all_ junk produced by switch engines.
Here's an attempt at an update. I included period 52 in the list of emu periods, but I'm not entirely sure it really belongs there: does a signal loop count as a "Herschel loop" as long as there's a Herschel in the loop somewhere -- even if the signal turns into a triplet of gliders at several points?wildmyron wrote:
- :Herschel loop: needs to be updated to reflect the recently discovered p52 loop.
- As for :Herschel loop:, :emu: should also include p52 in list of flightless herschel loop periods.
:Herschel loop: A cyclic {Herschel track}. Although no loop of length less than 120 generations has been constructed it is possible to make {oscillator}s of smaller periods by putting more than one Herschel in a higher-period track. In this way oscillators, and in most cases {gun}s, of all periods from 54 onwards can now be constructed (although the p55 case is a bit strange, shooting itself with gliders in order to stabilize itself). A mechanism for a period-52 loop was found in April 2018, but it includes stages where the signal is carried by triplets of {glider}s so it may not be considered to be a pure Herschel loop. The missing period, 53, is a difficult case simply because 53 is prime and so no small sparkers or reflectors are available.
See {Simkin glider gun} and {p256 gun} for the smallest known Herschel loops. See also {emu} and {omniperiodic}.
I think the snark would count as a small p53 reflector. I would rewrite that sentence as follows:The missing period, 53, is a difficult case simply because 53 is prime and so no small sparkers or reflectors are available.
The missing period, 53, is a difficult case, because 53 is prime and no small sparkers are available.
Please feel free to ignore my suggestions when they don't make sense! I remembered the p52 loop being posted when I read the entry and to be honest I didn't even run the pattern or consider whether it qualified as a Herschel loop or an emu. However, I think your draft makes sense - the signals in the p52 loop are predominantly Herschels, though you do then have a hazy definition for what qualifies as a Herschel loop.dvgrn wrote:Here's an attempt at an update. I included period 52 in the list of emu periods, but I'm not entirely sure it really belongs there: does a signal loop count as a "Herschel loop" as long as there's a Herschel in the loop somewhere -- even if the signal turns into a triplet of gliders at several points?wildmyron wrote:
- :Herschel loop: needs to be updated to reflect the recently discovered p52 loop.
- As for :Herschel loop:, :emu: should also include p52 in list of flightless herschel loop periods.
Yeah, the history of spaceship synthesis is good as far as it goes, but it stops in 2003... For Release 30 it would probably be worth mentioning in each relevant spaceship article the discoverer and date of all the recent glider syntheses.wildmyron wrote:I looked through 'G' and didn't find any issues of note aside from a few references to 2017. Perhaps someone else can review the :glider synthesis: entry as that's such an active and large topic. It may be worthwhile adding some more content about the current state of glider synthesis technology - particularly for spaceships.
Yes! It was early this morning -- at least as long as no one finds awful horrible problems before Andrew gets around to a Golly 3.2 release build.wildmyron wrote:I guess we're getting down to the wire for including further corrections to v29 in Golly. Is there a date for checkin of final v29 version?
The patch to the single-page :spaceship: table is done, so the single-page preview should be correct now, and should exactly match what's in Golly.dvgrn wrote:...noticed this morning that my manual post-processing notes weren't updated with Sokwe's correction to the single-page :spaceship: table, so it still links to 25P3H1V0.2 instead of 25P3H1V0.1. (Not a problem for the Golly multi-page HTML.) So I'll have to do a little quick patching and rebuilding ZIP files in the next few days, and do another checkin before moving things over to conwaylife.com/ref/lexicon.
Anybody see anything else I broke? Other little stuff can get rolled into the same patch.
The table of elementary spaceships in the entry for :spaceship: has an error:dvgrn wrote:The patch to the single-page :spaceship: table is done, so the single-page preview should be correct now, and should exactly match what's in Golly.
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(2,1)c/7 oblique Sir Robin Adam P. Goucher Mar 2018
Already corrected (but I can't build/push updated lexicons, so it's not showing up anywhere yet).wildmyron wrote:The table of elementary spaceships in the entry for :spaceship: has an error:which obviously should read (2,1)c/6.Code: Select all
(2,1)c/7 oblique Sir Robin Adam P. Goucher Mar 2018
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diff --git a/Help/Lexicon/lex_q.htm b/Help/Lexicon/lex_q.htm
index 618db9d..ed2f114 100755
--- a/Help/Lexicon/lex_q.htm
+++ b/Help/Lexicon/lex_q.htm
@@ -103,7 +103,7 @@ theoretically still be found.
<p><a name=quadraticfilter>:</a><b>quadratic filter</b> A <a href="lex_t.htm#toolkit">toolkit</a> developed by Dean Hickerson and Gabriel
Nivasch in 2006, enabling the construction of patterns with
asymptotic population growth matching an infinite number of different
-sublinear functions - namely, O(<i>t</i><sup><i>(</i></sup>1/2<sup><i>n</i></sup>)) for any chosen <i>n</i>. See
+sublinear functions - namely, O(<i>t</i><sup>1/2<sup><i>n</i></sup></sup>) for any chosen <i>n</i>. See
also <a href="lex_e.htm#exponentialfilter">exponential filter</a>, <a href="lex_r.htm#recursivefilter">recursive filter</a>.
<p><a name=quadraticgrowth>:</a><b>quadratic growth</b> The fastest possible asymptotic rate of population
growth for any Life pattern - O(<i>t</i><sup>2</sup>) in big-O notation, where <i>t</i> is
diff --git a/Help/Lexicon/lex_s.htm b/Help/Lexicon/lex_s.htm
index 368362c..7e1290a 100644
--- a/Help/Lexicon/lex_s.htm
+++ b/Help/Lexicon/lex_s.htm
@@ -1647,7 +1647,7 @@ with new velocities as of July 2018.
c/7 orthogonal <a href="lex_l.htm#loafer">loafer</a> Josh Ball Feb 2013
c/10 orthogonal <a href="lex_c.htm#copperhead">copperhead</a> zdr Mar 2016
3c/7 orthogonal <a href="lex_s.htm#spaghettimonster">spaghetti monster</a> Tim Coe Jun 2016
- (2,1)c/7 oblique <a href="lex_s.htm#sirrobin">Sir Robin</a> Adam P. Goucher Mar 2018
+ (2,1)c/6 oblique <a href="lex_s.htm#sirrobin">Sir Robin</a> Adam P. Goucher Mar 2018
-----------------------------------------------------------------
</pre>
<p>Several infinite families of adjustable-velocity <a href="lex_m.htm#macrospaceship">macro-spaceships</a>
Thanks very much for the reminder and the 2/3 patch! I've been away on a no-wifi-available vacation for the last week or so. I'll try to get fixes for these three issues checked in to Golly in the next few days.wildmyron wrote: ↑October 8th, 2019, 2:47 amThree are three outstanding issues from previous review comments which didn't make it into the latest Lexicon release (or the current Golly version)
- speed of Sir Robin in :spaceship
- formatting of big-O notation for :quadratic filter
- Dean Hickerson's comments about the first c/3 spaceship found
This would be awesome. And both Github and Gitlab have good web-based workflows that make reviewing and merging pull requests etc. a breeze.dvgrn wrote: ↑October 9th, 2019, 12:22 pmI've been keeping the latest no-word-wrap text edition of the Life Lexicon on Google Drive, shared so far with David Bell and Apple Bottom since they contributed a lot of new wording and various useful fixes to Release 29. It's probably high time to join the modern age, and make the current To Be Done notes available in a Git repository somewhere, as well as the absolute-latest text Lexicon (from which the single-page, multi-page, and Golly HTML versions are semi-automatically built).
On that note, anyone who's active on the wiki should feel absolutely free to edit this page (and whatever subpages it may have) as well; even though it lives below my userpage, it's really for general coordination.The associated project of double-checking that new information from the Lexicon has made it to the LifeWiki -- preferably in somewhat more depth, with associated LifeViewer embedded patterns, links, and references -- is much farther from completion. New Lexicon articles are all present in some form in the LifeWiki, but they may be in need of standardization, and there's a long list of articles that should be reviewed to make sure there's nothing new in the Lexicon entry that should be in the wiki article, or vice versa.
Well, let's see how it goes. The Life Lexicon no-wrap plaintext source is now in a shiny new Git repository, broken up by letter.Apple Bottom wrote: ↑October 10th, 2019, 2:44 amThis would be awesome. And both Github and Gitlab have good web-based workflows that make reviewing and merging pull requests etc. a breeze.dvgrn wrote: ↑October 9th, 2019, 12:22 pmIt's probably high time to join the modern age, and make the current To Be Done notes available in a Git repository somewhere, as well as the absolute-latest text Lexicon (from which the single-page, multi-page, and Golly HTML versions are semi-automatically built).
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x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo!
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x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!
Hmm, this error was already mentioned in July 2018 and thereafter mentioned to be fixed:JP21 wrote: ↑December 24th, 2019, 8:03 amThere is a mistake:
https://conwaylife.com/ref/lexicon/lex_s.htm#spaceship
[(2,1)c/7 oblique Sir Robin Adam P. Goucher Mar 2018]
Sir Robin is not c/7
So maybe that /ref/ page isn't up-to-date with the Github of the Lexicon?wildmyron wrote: ↑July 5th, 2018, 11:04 pmThe table of elementary spaceships in the entry for :spaceship: has an error:dvgrn wrote:The patch to the single-page :spaceship: table is done, so the single-page preview should be correct now, and should exactly match what's in Golly.which obviously should read (2,1)c/6.Code: Select all
(2,1)c/7 oblique Sir Robin Adam P. Goucher Mar 2018
Also, what came of Dean Hickerson's comments on the Golly list about the first c/3 ship discovered in early August 1989?
I'm still not sure what happened there exactly. The source text (now stored here and here) definitely got fixed when I said it did, but somehow Golly 3.3 ended up with a lex_s HTML file without that fix. There are just a few too many manual stages in the update and checkin process, so it's easy for bugs like this to creep in and hide in various files that were supposed to be already fixed.