Talk:Chain rule for Kolmogorov complexity

	Mathematics portal This article is within the scope of WikiProject Mathematics, a collaborative effort to improve the coverage of mathematics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.MathematicsWikipedia:WikiProject MathematicsTemplate:WikiProject Mathematicsmathematics
Low	This article has been rated as Low-priority on the project's priority scale.

Statistics Low‑importance

	This article is within the scope of WikiProject Statistics, a collaborative effort to improve the coverage of statistics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.StatisticsWikipedia:WikiProject StatisticsTemplate:WikiProject StatisticsStatistics
Low	This article has been rated as Low-importance on the importance scale.

Reference

I am concerned that the book Li, Ming; Vitányi, Paul (February 1997) does not appear to Google Books to contain the phrase "chain rule". Can anyone give a page reference? Deltahedron (talk) 17:02, 4 May 2014 (UTC)[reply]

"Chain rule", as a term, does not appear in Li & Vitányi. They use conditional complexity to denote H(x|y), but that term isn't mentioned here. It's possible that the older sources might use this "chain rule" terminology, but it also might be the case of someone writing stuff in wikipedia in their own terminology. (It wouldn't be the first time I see that happen.) Similar expressions are called "chain rule" in other fields, most notably the chain rule about conditional probabilities. JMP EAX (talk) 12:38, 24 July 2014 (UTC)[reply]

Also, the book Thomas M. Cover; Joy A. Thomas (2006). Elements of Information Theory (2nd ed.). John Wiley & Sons. ISBN 978-0-471-74881-6. uses "chain rule" aplenty for entropy etc., but never for Kolmogorov complexity. JMP EAX (talk) 14:01, 24 July 2014 (UTC)[reply]