User talk:Chan-Ho Suh

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Chan-Ho is currently busy in real life and may not respond swiftly to queries.

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Contents 1 Untitled 2 Requesting copyedit for Fly to the Sky 3 User page comments 4 JSJ decomposition 5 S. M. Stirling 6 Marcu

[edit] Untitled

I've been having run-ins with this guy Friday who deletes my articles whie they are still in development without even flagging them for deletion. I don't want to get in trouble for restoring deleted content, but if he just deletes them wihout giving them a chance for discussion and/or editing this seems to be counter-intuitive to creating articles. --—The preceding unsigned comment was added by In Defense of the Artist (talk • contribs).

I'm not sure why you are mentioning this to me. Do I know you? In any case, I took a look at the discussion on Friday's talk page. It doesn't appear to me he is acting inappropriately. --Chan-Ho (Talk) 20:43, 18 November 2006 (UTC)

[edit] Requesting copyedit for Fly to the Sky

I'm just a high-schooler so my writing isn't too sophisticated. Recently, I was trying to improve the Fly to the Sky page. I was wondering if you could copy-edit? mirageinred 17:06, 7 November 2006 (UTC)

[edit] User page comments

Thank you for experimenting with the page User:Jbaber on Wikipedia. Your test worked, and it has been reverted or removed. Please use the sandbox for any other tests you may want to do. Take a look at the welcome page to learn more about contributing to our encyclopedia. Ginkgo100 ^{talk · e@} 23:28, 15 November 2006 (UTC)

Thank you, but there appears to be some confusion. No need to thank me for "experimenting". It was actually a kind of vandalism. And I have my very own sandbox! All mine. I will look at the welcome page...but it's always changing!! What's up with dat? For great diligence! --Chan-Ho (Talk) 23:51, 15 November 2006 (UTC)

[edit] JSJ decomposition

According to Jaco (page 3 of An Algorithm to Construct the JSJ Decomposition of a 3-manifold.) the phrase "closure of" that you removed should be there. Which of you is right? R.e.b. 02:08, 20 November 2006 (UTC)

Well, this is a matter of terminology, mostly, that can confuse people who intepret the terms literally. There can be nonseparating tori in the JSJ decomposition. For example, consider a hyperbolic link complement with two boundary components where you glue the boundary components together. The JSJ decomposition is the torus that results from this gluing. But the closure of the single component that is the complement of the torus is obviously the whole manifold, which is not atoroidal or Seifert-Fibered. So saying the "closure of M-T" is bad.

This kind of ambiguity arises from the fact that either closure or "M-T", etc. needs to be defined appropriately. Usually, as a sloppy shorthand, something like "M-T", in this context, really means evacuate the interior of a closed regular neighborhood of T; some, like Hatcher, choose to use a different notation for this operation. Some (perhaps Jaco) may mean the complement, in which case "closure" has to mean something else like say, the metric completion of the complement from an arbitrary path metric on M. So sometimes people do say stuff like "closure of the complement", but it's understood by those in 3-manifolds to not mean "closure of the complement" but something like I described. And I think a good number of people choose to avoid this kind of misleading usage.

I should emphasize, however, that the way JSJ decomposition is written, this is all avoided. There, the phrase "cutting" is used. Cutting along a surface is a precisely defined operation (the evacuation procedure I described above). Using "closure" in addition to this is, I think, confusing and liable to trip people up, partly because it starts them thinking about the set theoretic complement. --Chan-Ho (Talk) 05:57, 20 November 2006 (UTC)

I think the confusion is caused because there are 2 different versions of the JSJ decomposition. Jaco goes on to take the tori as the boundary of the characteristic (Seifert) submanifold, which requires that every non-separating torus in your version is replaced by 2 parallel copies. This second version has more tori, and has the word "closure of" in the statement. (Also Jaco seems to have incorrectly omitted the minimality condition: I dont see why you cant just add lots of parallel copies of tori in his version.) R.e.b. 14:46, 20 November 2006 (UTC)

Oops, I see now. Yeah, I guess it's not a terminology issue after all. Although if "closure" is to be added, I would prefer "cutting" to be removed, and just say "complement".

Jaco has the minimality condition in the description of the torus decomposition. This minimality condition needs to be transferred over to his statement about the characteristic submanifold. So one takes the maximal Seifert fibered submanifold so that it's complement is atoroidal. --Chan-Ho (Talk) 17:40, 20 November 2006 (UTC)

[edit] S. M. Stirling

Thanks for the help on this, and thanks too for reverting the vandalism of my talk page. Whoever this guy is, he has a serious axe to grind. - Merzbow 06:44, 25 November 2006 (UTC)

Minor clarification... I just noticed it was actually someone else who helped with my Talk Page, but the other thanks stands. :) - Merzbow 06:48, 25 November 2006 (UTC)

[edit] Marcu

If you are ever in Berkeley, check out the "Editorial statement" on the Danut Marcu. Mhym 06:14, 10 December 2006 (UTC)

Title Saitama mathematical journal.

Location(s): Math QA1.S28

Shelved: Unbound issues on Display Shelves - Alphabetically

Library has: 1(1983)-

I'm hardly ever there, and it seems unlikely I would be looking for this if I were! The less time Wikipedia interferes with my life the better :-) --Chan-Ho (Talk) 09:38, 10 December 2006 (UTC)