Talk:Exceptional isomorphism
 | This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
| |||||||||||
Possible relevant paper
[edit]Is Andreas Blass's "Seven Trees in One" a relevant example of an isomorphism? There is an isomorphism between the set of figures binary trees and the seven-fold Cartesian product of that set that is particularly simple to write down via casework, while the same cannot be said for two-, three-, four-, five-, or six-fold Cartesian product. C7XWiki (talk) 09:39, 5 January 2023 (UTC)
Possible error in the Coxeter-Dynkin diagrams section
[edit]In the section it states that A_2 ≅ I_2(2), which appears to be a typo and conflicts with every other wikipedia page on the subject, including Coxeter group and Coxeter-Dynkin diagram, which explicitly state that A_2 ≅ I_2(3), and Coxeter notation, which implicitly states it because [p] = I_2(p) and A_2 = [3]. I also cannot find any sources stating what this article does, but I'm not the most versed in the topic, so I might have missed it. Eisenstein Integer (talk) 11:37, 16 January 2025 (UTC)