Talk:Projective linear group

message: It seems to me that in the section "Topology", in the paragraph on PGL(n,C), there are two variables called "n" - one numbering the homotopy groups, and one numbering the dimension in PGL(n,C). This makes the actual statement unclear. I don't feel qualified to fix this myself without introducing other errors.  
2003:DF:2711:13C8:F4CE:92BE:B665:FBB2 (talk) 13:53, 5 April 2021 (UTC)
thread_title:  Notation Error? 

message: :Section added. —Nils von Barth (nbarth) (talk) 00:16, 2 November 2009 (UTC)
replies: text: Should be right, proved by 1950 probably. Charles Matthews 20:43, 10 February 2006 (UTC)
thread_title:  Simple? 

message: (q^n-1)(q-1)=1+q+\cdots+q^{n-1} ???, this is wrong since q should be greater than 1 —Preceding unsigned comment added by 130.233.158.3 (talk • contribs) 2010-08-10T08:06:28Z
:The missing division sign is now fixed. JackSchmidt (talk) 13:21, 10 August 2010 (UTC)
thread_title:  Action on ''p'' points ==

message: I think this claim:
PSL(n, K) and PGL(n, K) are algebraic groups of dimension n^2-1
is at best misleading and at worst wrong.
eg. http://mathoverflow.net/questions/16145/what-is-the-difference-between-psl-2-and-pgl-2/16175#16175  — Preceding unsigned comment added by 171.64.38.77 (talk) 23:40, 29 March 2012 (UTC)
thread_title:  As an algebraic group 

message: At the top of the article is a useful-looking diagram showing homomorphisms between various groups. The arrows indicating the homomorphisms vary: single heads and double heads, straight tails and curly tails. I do not know what these distinctions mean, and I do not know how to find out. I have searched Wikipedia and found no explanation, though I have found more such diagrams (e.g. at Schur multiplier).
I guess the best place for explanations of the arrow types would be at group homomorphism, but they're not there. Can anyone help? Maproom (talk) 08:29, 3 June 2013 (UTC)
replies: text: Try Commutative_diagram#Symbols.  Spectral sequence (talk) 20:22, 3 June 2013 (UTC)
thread_title:  Diagram with arrows 

message: This section claims that "the subgroup C3 < S3 consisting of the 3-cycles and the identity () (0 1 ∞) (0 ∞ 1) stabilizes the golden ratio and inverse golden ratio". I think this is wrong, the two stabilized values are e^{\pm \pi i/3}, as the article for the Cross-ratio correctly claims. I'd edit it but I don't have the skills to edit the accompanying image.
84.121.59.163 (talk) 10:08, 3 February 2017 (UTC)
thread_title:  Projective_linear_group#Modular_group 

message: In the subsection Exceptional isomorphisms of the section Finite fields, suddenly the notation Ln(pk) is used extensively without explanation. The explanation appears only at the beginning of the section Finite fields. This is too difficult to find if someone is just reading that subsection.
If it is necessary to use different notations for the same group in the same article, then please at least explain the new notation just before it is used. At the beginning of the subsection Exceptional isomorphisms would be a good place to explain it, or at least remind the reader of it.50.205.142.50 (talk) 19:34, 6 May 2020 (UTC)
thread_title:  Unexplained notation