# Talk:3-manifold

Page contents not supported in other languages.
WikiProject Mathematics (Rated C-class, High-priority)

## Reference requested

Is there anybody who would want complete a reference due to Lackenby, please? —The preceding unsigned comment was added by Juan Marquez (talkcontribs).

Which one? There's no reference to Lackenby in this article, although he's mentioned in alternating knot, where I've added the reference, and also he's mentioned in the talk page for Heegaard splitting. Where exactly did you see mention of Lackenby? If I wrote it (which is likely), I can give you the reference. --C S (Talk) 15:18, 11 April 2006 (UTC)

## Deleting five dimensions

Prior to my edit, there was a claim that spacetime might be five dimensional. I'm pretty up on these topics, and I've never heard this claim before. I'm deleting it. If anyone wants to revert, we can discuss it. —Preceding unsigned comment added by 129.215.255.13 (talk) 15:08, 20 August 2009 (UTC)

## wikimedia commons sketches

I opened a section [1] in Wikimedia Commons to illustrate some of the very basic 3d spaces to give a better idea of the beasts lurking in this land, enjoy!--kmath (talk) 02:47, 4 November 2009 (UTC)

more contributions are welcome--kmath (talk) 02:57, 4 November 2009 (UTC)

## Categories?

What does it mean that the topological, piecewise linear, and smooth "categories" are all the same? Not in a category-theory sense, right? Crasshopper (talk) 05:52, 12 December 2010 (UTC)

## Possible typo

The caption reads: All of the cubes in the image are the same cube, since light in the manifold wraps around into closed loops, the effect is that the cube is tiling all of space.

Was tiling supposed to read filling? Just asking --guyvan52 (talk) 23:10, 27 May 2014 (UTC)

Hello fellow Wikipedians,

I have just modified one external link on 3-manifold. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 18 January 2022).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot 15:38, 22 June 2017 (UTC)

## Lower star for induced map under \pi_1?

Under the Simple Loop Conjecture, I believe the induced map is typically written as f_* as opposed to f^*. Baldersmash (talk) 23:21, 2 March 2019 (UTC)

• Yes, definitely. I fixed that. Turgidson (talk) 20:10, 3 March 2019 (UTC)