User talk:Geometry guy

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Chandra-crab.jpg

Welcome to my (rather minimalist) user and user talk page: please leave comments, questions, complaints, or just general chat below. Please provide direct links to issues you raise. I am contributing rather sporadically at present and can't promise to reply, but if I do I will reply here: if I take a while and it is important, I will drop a note on your talk page.

Cartan formalism[edit]

Re your comment on http://en.wikipedia.org/wiki/Talk:Cartan_formalism_%28physics%29

What do you mean by a Poincare fiber? It sounds like spacetime multiplied by a little Goldberg Sphere at each point, but I get the feeling it's more complicated than that...

166.137.101.174 (talk) 09:01, 24 June 2014 (UTC)Collin237

I don't see where I said "Poincare fiber". By "Poincare group" I mean the semidirect product of the Lorentz group with spacetime translations. What is a Goldberg Sphere? Geometry guy 20:32, 3 August 2014 (UTC)

Proposed change to Consensus for a unified approach to bias categories at Category:Antisemitism[edit]

Due to your involvement in the 2011 CFD that decided on a unified approach to bias categories, you may be interested in a current proposal to change that approach with regard to the Category:Antisemitism. Dlv999 (talk) 15:38, 23 June 2014 (UTC)

Belated thanks for the notification. Geometry guy 20:32, 3 August 2014 (UTC)

Nomination for deletion of Template:Google books quote[edit]

Ambox warning blue.svgTemplate:Google books quote has been nominated for deletion. You are invited to comment on the discussion at the template's entry on the Templates for discussion page. Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 10:22, 20 October 2014 (UTC)

The original and best. They don't make google books quoting templates like that any more. May it rest in peace. Can someone please organize a wake? Geometry guy 22:42, 22 December 2014 (UTC)

Cartan connection[edit]

Hi GeometryGuy. I see from the talk page at Cartan connection that you stand out among the contributors and commenters there as somebody who really understands what's going on. Therefore for the moment this private message here instead of a comment on that talk page. Of course one of the causes of many people's confusion here is that would-be authorative sources such as notably Sharpe's book make what should be a clear statement become much more mysterious than it ought to be. At one point this still affects the entry: Sharpe has this curious way of stating the definition via Cech cocycles (aka "gauge transitions") without stating the cocycle condition for the transition functions itself. Instead he considers the effective situation where they are uniquely fixed already by the local 1-form data and then switches from Cech cocycles to Ehresmann connection data for the general case. But in the Wikipedia entry on Cartan connection it would be better to state this correctly, by adding to the paragraph "via gauge transitions" the cocycle condition h_{U V} h_{T U} = h_{T V}. Urs Schreiber (talk) 00:25, 16 December 2014 (UTC)

Thanks, and good point. There is so much still wrong with that article I can hardly bear to look at it again. Please go ahead and fix it if you have time. I will take a closer look when I can. Geometry guy 22:42, 22 December 2014 (UTC) PS. You do great work at the nLab.

Seasons greetings...[edit]

...just in case anyone is watching this page, or happens to stop by over the festive period!

May your Yule be Cool and your Hootenanny Hot. Geometry guy 22:48, 22 December 2014 (UTC)

Well lookie who's here !!!! Was just dropping your name the other day, although I can't recall where or why. It's wonderful to "see" you, and I hope you have a wonderful holiday and a joyous year! SandyGeorgia (Talk) 01:43, 23 December 2014 (UTC)
Memory: one was at Wikipedia:Education noticeboard/Incidents/Archive1#Good Articles for Grades, and the other was Wikipedia:Featured article review/Euclidean algorithm/archive1. For a Very Merry Christmas, read this (before they spike the eggnog):

The Euclidean algorithm is a basic tools for proving many fundamental properties of the integers, such as Euclid's lemma, Bézout identity, the fundamental theorem of arithmetic. It is also used, directly or through its consequences for many advanced results, such as the classification of finite Abelian group. It allows to compute modular multiplicative inverses, and is therefore used for the classification of finite fields and for the computation in these fields. As a large part of modern number theory uses finite fields, the Euclidean algorithm is indirectly used in many deep results, such as the Wiles' proof of Fermat's Last Theorem.

Cheers! SandyGeorgia (Talk) 01:48, 23 December 2014 (UTC)