Talk:Disk (mathematics)

Merge to circle
I think this article should be merged into Circle. Just because a disk and a circle are mathematically different doesn't mean they can't both be dealt with under the circle topic. It would also enable the business about the confusion between a disk and a circle to be dealt with in one place cleanly. Dmcq (talk) 09:29, 26 February 2010 (UTC)
 * Nope. Most languages distinguish them, so you proposal would create even a worse interwiki mess than we have today. Incnis Mrsi (talk) 15:55, 27 February 2010 (UTC)
 * GOOD POINT. Finally someone understands this crisis.--**Najezeko**:) 19:45, 14 November 2010 (UTC)

This article should not be merged. Admittedly, the difference between the disc and circle may seem semantic, it is one which should be acknowledged. I mean, the article needs to cite sources, but it does appear accurate. If you ever refer to a circle instead of a disc, a mathematician will probably correct you, so the difference is more than semantic. ( I'm a math major in undergrad and I personally made the mistake of writing circle, a curve, instead of disc, the planar area inside the curve,and so I had it explained to me the importance of the difference between them by several mathematically knowledgable people). Zanotam - Google me (talk) 01:50, 3 December 2010 (UTC)


 * I am trying to solve a mess in PT wiki about this nomenclature problem and wanted to hear from you: isn't the curve made by the points r-distanced from the center called circunference instead of circle? In my non mathematician interpretation:
 * 1. Circumference: external line, its points, equidistant from the center
 * 2. Disk: the planar area inside a circunference.
 * 3. Circle: the geometric shape determined by a circunference (kinda disk + circumference) Sintropepe (talk) 21:52, 8 January 2024 (UTC)
 * Note that you are replying to a 13-year-old conversation. Anyhow, in previous centuries the word "circle" was sometimes used to mean what we now call a "circle" and other times used to mean what we now call a "disk", and the word "circumference" was sometimes used to mean what we now call a "circle". Nowadays, they are still sometimes used these ways in informal contexts. In modern technical contexts, circle means just the one-dimensional boundary of the disk, disk means the two-dimensional filled-in shape, and circumference typically means the arc length around the circle. I can't tell you what the conventions are in Portuguese. –jacobolus (t) 22:59, 8 January 2024 (UTC)
 * I don’t favour any change. In normal usage the term ‘circle’ is often used when discussing the properties of a disk, eg. its area, and these are accordingly covered in the ‘circle’ article. The disk article is limited to properties of the disk which would not apply to a circle, eg. its topological properties. On the other hand there is a standard statistical distribution over a circle – the circular normal distribution – which is quite separate from distributions over a disk, and which could reasonably be mentioned in the ‘circle’ article. It would make things worse to move properties of a circle which are distinguished from those of a disk to the ‘circumference’ article. I don’t think the word ‘circumference’ occurs in the article on the circular normal distribution, even though on sintropepe’s understanding it would be the only correct term. Colin.champion (talk) 08:20, 9 January 2024 (UTC)
 * These concepts should absolutely not be joined together. Both articles can be significantly expanded with largely unrelated material. –jacobolus (t) 08:59, 9 January 2024 (UTC)

Homeomorphic
I'm suggesting that someone put a link to the article "homeomorphic". If there is no such article (I highly doubt there isn't), then please create one.--**Najezeko**:) 19:49, 14 November 2010 (UTC) —Preceding unsigned comment added by Najzeko (talk • contribs)

region surrounding the closed disk
What is the region surrounding the closed disk called? — Preceding unsigned comment added by Reddwarf2956 (talk • contribs) 06:26, 7 September 2013 (UTC)


 * “Exterior” should do, or “complement” —Tamfang (talk) 00:23, 20 June 2018 (UTC)