Talk:Subjective logic

From Wikipedia, the free encyclopedia
Jump to: navigation, search
WikiProject Philosophy (Rated Start-class, Mid-importance)
WikiProject icon This article is within the scope of WikiProject Philosophy, a collaborative effort to improve the coverage of content related to philosophy on Wikipedia. If you would like to support the project, please visit the project page, where you can get more details on how you can help, and where you can join the general discussion about philosophy content on Wikipedia.
Start-Class article Start  This article has been rated as Start-Class on the project's quality scale.
 Mid  This article has been rated as Mid-importance on the project's importance scale.


What happens on the metalevel of subjective logic. Does it assume classical logic on the metalevel. —Preceding unsigned comment added by Sherlock999 (talkcontribs) 09:10, 19 September 2010 (UTC)

Sherlock999 (talk) 09:14, 19 September 2010 (UTC)


Nominated for Did you know? Gregbard 00:01, 27 July 2007 (UTC)

Ridiculous templates[edit]

I have removed the "OR" and "COI" templates from this article because they are misleading and unnecessary, in my opinion.

I have reviewed some of the scholarly literature on "subjective logic", which is in fact an application of probability theory to human belief systems, in which people may be uncertain as to the truth or falsity of a particular statement. Prior to 1997, the phrase "subjective logic" had been used sporadically, and was not well defined. Since 1997, it has been used quite extensively, usually with the precise meaning described in this article.

It's hardly surprising that the name "Jøsang" shows up among the cited works, because A. Jøsang's name appears on almost every scholarly work on this subject, either as an author, or in the citations. And A. Jøsang has been very widely cited by other authors.

I do not believe [(0, 1, 0), in the language of this article] that the proscription of "original research" is intended to prevent experts from writing articles for Wikipedia. That is why I have removed the templates. DavidCBryant 00:11, 27 July 2007 (UTC)


The article has its sections, and wikilinks. I think it's a wonderful start. Gregbard 03:06, 27 July 2007 (UTC)

Fuzzy logic[edit]

What's the relationship with Fuzzy Logic? It looks like Subjective Logic is FL with an added uncertainty dimension. If so, should there at least be some mutual "See Also" links? On the other hand, the FL article is not part of WikiProject Logic. It would be useful to understand the relationship, if any, either here or in the article. Phil Smith 10:54, 27 July 2007 (UTC)

Fuzzy Logic is part of WikiProject Logic. It's just that the project is very new and not all the pages are tagged. This week sometime a bot will go out and tag them all. Feel free to sign up for the Wikipedia:WikiProject Logic. Be well, Gregbard 11:18, 27 July 2007 (UTC)

Thanks for the comments. Well, fuzzy logic uses linguistically vague statements such as "tall" or "hot", whereas in fact you can express with arbitrarily crisp and exact measures how tall somebody is or how hot an engine is. Fuzzy logic transforms these crisp measures into fuzzy measures through triangular membership functions. The fuzzy measures express to what degree somebody is tall or an engine is hot.

In subjective logic, the statements are normally assumed to be crisp, as opposed to vague. Furthermore there are no crisp measures available, instead people have subjective beliefs about the truth of those statements. So it seems that fuzzy and subjective logic are quite different with regard to what is assumed crisp and what is assumed vague and uncertain. That does not mean that the two logics can not be combined, in fact I think they can. --Audun 08:39, 9 August 2007 (UTC)

But this notion is already captured by Probability theory. To me it is not clear, what Subjective Logic offers in addition.

Basis for the article[edit]

The article was started because I noticed that the article on probabilistic logic requested one. It's relatively new stuff and not in the text books yet. I started working on subjective logic in 1997 and a few other people have also been involved in developing it. The original purpose of subjective logic was for modelling trust networks, then it became a general purpose formalism for reasoning with uncertainty. The current article describes the main characteristics of subjective logic, but not the mathematical details of the operators. I guess a book is needed for that. At the moment, people must read the papers to get the details. --Audun 08:19, 9 August 2007 (UTC)

Is this a valid wikipedia article?[edit]

Should this article be here if every single reference is from the same source? (A. Jøsang) I think that shows that these are not generally accepted ideas, and this page is just promoting one guy's ideas. — Preceding unsigned comment added by (talk) 09:49, 25 January 2012 (UTC)

This is valid area, and more work has been done on this. But the article needs to be expanded. Iæfai (talk) 23:10, 25 October 2014 (UTC)


At the top of the article there is this sentence "Irrationality can be described in terms of what is known as the fuzzjective." This appears to be pulled from an earlier version of the article on Fuzzy Logic (which in turn came from this paper: Fuzzy logic and subjective logic are not the same thing and in none of the papers on subjective logic can I find any reference to the term "fuzzjective" or irrationality or any such measure of it. I'm going to pull the sentence for now. (talk) 21:38, 30 September 2016 (UTC)