Com­mon Knowledge

TagLast edit: 9 Feb 2021 7:59 UTC by Yoav Ravid

Common knowledge is information that everyone knows and, importantly, that everyone knows that everyone knows, and so on, ad infinitum. If information is common knowledge in a group of people, that information that can be relied and acted upon with the trust that everyone else is also coordinating around that information. This stands, in contrast, to merely publicly known information where one person cannot be sure that another person knows the information, or that another person knows that they know the information. Establishing true common knowledge is, in fact, rather hard.

Related Pages: Public discourse, Consensus, Inferential Distance

External posts:
The Kolmogorov option by Scott Aaronson
kolmogorov complicity and-the parable of lightning by Scott Alexander

The Costly Co­or­di­na­tion Mechanism of Com­mon Knowledge

Ben Pace15 Mar 2018 20:20 UTC
158 points
30 comments19 min readLW link

Un­rol­ling so­cial metacog­ni­tion: Three lev­els of meta are not enough.

Academian25 Aug 2018 12:00 UTC
169 points
44 comments7 min readLW link

Scott Aaron­son: Com­mon knowl­edge and Au­mann’s agree­ment theorem

gjm17 Aug 2015 8:41 UTC
23 points
4 comments1 min readLW link

You Have About Five Words

Raemon12 Mar 2019 20:30 UTC
128 points
71 comments1 min readLW link2 nominations6 reviews

The Fear of Com­mon Knowledge

Eliezer Yudkowsky9 Jul 2008 9:48 UTC
38 points
37 comments2 min readLW link

There’s No Fire Alarm for Ar­tifi­cial Gen­eral Intelligence

Eliezer Yudkowsky13 Oct 2017 21:38 UTC
103 points
67 comments25 min readLW link

Lo­cal Val­idity as a Key to San­ity and Civilization

Eliezer Yudkowsky7 Apr 2018 4:25 UTC
131 points
65 comments13 min readLW link

In the pres­ence of dis­in­for­ma­tion, col­lec­tive episte­mol­ogy re­quires lo­cal modeling

jessicata15 Dec 2017 9:54 UTC
76 points
39 comments5 min readLW link

Prob­a­bil­ity Space & Au­mann Agreement

Wei_Dai10 Dec 2009 21:57 UTC
50 points
76 comments5 min readLW link

FB/​Dis­cord Style Reacts

Raemon1 Jun 2019 21:34 UTC
75 points
79 comments5 min readLW link

Every­body Knows

Zvi2 Jul 2019 12:20 UTC
97 points
20 comments4 min readLW link2 nominations1 review

Speak­ing up pub­li­cly is heroic

jefftk2 Nov 2019 12:00 UTC
42 points
2 comments1 min readLW link

It Was You Who Made My Blue Eyes Blue

Scott Alexander15 Oct 2015 19:46 UTC
30 points
0 comments20 min readLW link

Soviet-era Jokes, Com­mon Knowl­edge, Irony

Martin Sustrik12 May 2018 10:52 UTC
11 points
1 comment1 min readLW link

[Question] How to build com­mon knowl­edge of ra­tio­nal­ity and hon­esty?

MikkW21 Feb 2021 6:07 UTC
4 points
4 comments1 min readLW link
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