User talk:JackSchmidt/Archives/2009/06

Janko.at
You removed all of the categories on my article, saying that "categories describe the article, not the website". I looked it up and categories organize articles by topic. Judging by your user page you know what you're doing, but did you just delete all the categories because some of them were wrong/incorrect/inappropriate? I got those categories by going through my article, finding mini-topics, looking up the mini-topics and then putting their category codes on Janko.at, so they do describe the article. I am planning on removing Maine Coon categ's and the brand name games and year games, persain loanwords, etc, but the Wienerisch, cooking, chess, pets, etc, and all the puzzle stuff should stay.

I was just starting to go through them. From rapidly copying and pasting just Wiki's puzzle sites, I ended up with the category "Logic Puzzles" like 19 times.

Also, why did you remove the foreign language keywords? Were they just overlooked as you got rid of the outrageously enormous list of categories? (I dont deny there was a ridiculous amount of categories, but I was organizing and sorting through them.) Gatorgirl7563 (talk) 16:42, 3 June 2009 (UTC)
 * at their talk page. Actually it occurs to me they probably just did not notice the .  Sorry if it sounds too harsh; the extra categories and interwikis do have a massively widespread impact and make a whole lot of technical jobs a lot harder if they are around during a category/interwiki bot run or a database dump. JackSchmidt (talk) 19:10, 3 June 2009 (UTC)

stable module category
Dear JackSchmidt, I'm a noncommutative ring theorist and for my phs thesis I have to write a chapter about the stable module category and I'm looking for a good reference that treats the subjects in the most general way. Can you suggest me one? Thanks

marco perone —Preceding unsigned comment added by 147.162.22.189 (talk) 10:33, 9 June 2009 (UTC)


 * Sorry, I don't know very much about generality. Benson's books on Representations and Cohomology discuss the stable module category in the way that I tend to think of it: allowing one to treat the Heller operator as well-defined (the easy operator acts on finitely generated modules over a semi-perfect ring and returns the kernel of a projective cover).  Benson (p122, vol1) also describes using the stable module category when trying to treat Ext like Hom; Ext ignores projectives (or injectives) and so it is better to think of Ext like Hom in the stable category.  This second application is often in books describing the Auslander-Reiten theory (for representations of finite dimensional algebras).  I checked a few of my favorite books, and none discuss the stable category in much detail and all discuss it with a view towards applications to finite dimensional algebras, often symmetric (Frobenius) algebras. JackSchmidt (talk) 15:21, 9 June 2009 (UTC)

Raphaël Rouquier
Thanks for tidying up the missing wikilink. Gareth Jones (talk) 22:38, 17 June 2009 (UTC)

Tags
Thankf for your note. This is a strange one, I have turned the tagger off anyway, I will raise with WP:AWB team. Rich  Farmbrough 13:04 19  June 2009 (UTC). 13:04, 19 June 2009 (UTC)
 * No problem. Sorry for the note on SmackBot's page after this one.  I thought you were away, and apparently did not see the bright yellow notice.  At any rate, I gave a few more diffs, and suggested to both you (to suggest to AWB) and the uncat tagger to use uncatstub to avoid the ambiguity of whether "stub categories count" (they don't, but they do). JackSchmidt (talk) 13:23, 19 June 2009 (UTC)
 * SmackBot will convert uncat on a stub page to uncatstub, and I think AWB may do it too. Rich  Farmbrough 13:43 19  June 2009 (UTC).
 * Awesome thanks! I let the uncat tagger know too. JackSchmidt (talk) 13:58, 19 June 2009 (UTC)

Thanks!
Thanks for your contributions at the WP:ASE project! We need volunteers, so your help is much appreciated.

Also, I see that you are keen on finding references for facts, so you might be interested in my other project Wikipedia Reference Search, a search engine that searches only through a selection of "reliable" websites. If you want to add other reliable websites in the algebra domain, please let me know on my talk page. Cheers Nicolas1981 (talk) 05:42, 20 June 2009 (UTC)

Thanks for fixing central product
Hi! Sorry for making such an ugly edit to that page, I honestly meant to improve it, but this was my first Wikipedia edit and I am not very comfortable yet with the interface. You cleaned it up real nice. As for the definition, I changed it because I somehow figured that the definition we have learnt in class was the "standard" one, and it also happened to be the same as the one in Leedham-Green's book. Guess I was wrong (I am not at all an expert of this field). Anyhow, I'll try to do better next time. Artagas —Preceding undated comment added 21:47, 28 June 2009 (UTC).
 * No thank you! Your edit was good. It pointed out (1) that there is a stricter definition in common use, (2) the internal/external distinction, (3) the external distinction is tricky because the map really matters.  It also motivated me to include a stub section on "applications", and took care of the lack of a second reference.  Hopefully it will also motivate me to cover the specific case of two matrix groups over the same field, where the central subgroups are the scalar subgroups (this is subtly mentioned in CRLG-McK, but I think without example). JackSchmidt (talk) 01:00, 29 June 2009 (UTC)