Talk:G2 manifold

Someone has added material to the G2 article which is NOT about manifolds with special holonomy, but instead concerns the much weaker notation of reduction of structure group. I suspect that this was inserted by someone with an ulterior motive, for all the wrong reasons. This information is essentially irrelevant, and would merely serve to confuse people who do not understand the subject. I am therefore deleting it. — Preceding unsigned comment added by 74.108.33.11 (talk) 04:17, 20 June 2020 (UTC)[reply]

Joyce manifold?[edit]

I don't think that "Joyce manifold" is a correct term. In fact, in arxiv.org "Joyce manifold" is used only by pysicists, and mostly for 8-dimensional Spin(7)-examples. --Tiphareth 13:17, 18 April 2006 (UTC)[reply]

Based on the above, I'm removing the reference to "Joyce manifold." Jjauregui (talk) 21:42, 14 April 2008 (UTC)[reply]

Main Author: 	 Joyce, Dominic D.
Title: 	Compact manifolds with special holonomy / Dominic D. Joyce.
Published: 	Oxford : Oxford University Press, 2000.
Description: 	xii, 436 p. ; 24 cm.
ISBN: 	0198506015
Series: 	Oxford mathematical monographs
	Oxford science publications
Notes: 	Includes bibliographical references and index.
Subject(s): 	Manifolds (Mathematics)
	Holonomy groups.
Format: 	Entry not found.
	
	
Held at: 	University of Cambridge Colleges P-W
Cambridge University Library and dependent libraries

It's used for compact manifolds of G_2 holonomy. I've readded it.

It is not used. Google search: [1] About 95 results. This is statistically irrelevant (and it seems that 90% of these are about Spin(7)-manifolds) Tiphareth (talk) 05:23, 20 July 2016 (UTC)[reply]

Assessment comment[edit]

The comment(s) below were originally left at Talk:G2 manifold/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.

Time to start calibration (geometry) perhaps? Geometry guy 21:19, 17 September 2008 (UTC)[reply]

Last edited at 21:19, 17 September 2008 (UTC). Substituted at 02:08, 5 May 2016 (UTC)

Inappropriate content deleted[edit]

A previous version of this article contained a prominent reference to a very minor paper on a tangentially related topic. The deleted reference did not concern metrics of special holonomy, but instead was about topological reduction of the structure group of the frame bundle, which is an extremely weak condition indeed.

I have checked MathSciNet. There are exactly 8 citations of the deleted reference, and the majority of these are self-references by one of the authors. By contrast there are well over 400 references to the cited works by Joyce.

This article does not include citations of many important references, such as the work of Kovalev. That's fine --- it's just a short article to help the uninitiated get started. But cluttering it up with minor papers on tangential issues is not good for anyone. I hope that whoever has posted this material will understand that I have only taken it down for this clear and simple reason. — Preceding unsigned comment added by Occam1138 (talk • contribs) 16:10, 20 June 2020 (UTC)[reply]

Someone added this material back in, so I have undone their revision. 70.50.9.36 (talk) 23:37, 21 November 2020 (UTC)[reply]

Once again, someone has added this in again. I have removed it. It is hard to avoid the feeling that it is one of the authors of the referenced work that is adding this material in order to give the impression that their work is important. If so, it is having the opposite effect among experts in the field. 172.56.13.116 (talk) 23:12, 3 October 2022 (UTC)[reply]