Talk:Pencil (geometry)
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Untitled[edit]
It would be great to have a page on hyperbolic pencils. The reference I've been reading, which seems to do a good job, is Chapter 7 of Alan Beardon's "Geometry of Discrete Groups". Amazelgee (talk) 21:30, 15 July 2008 (UTC)
Link [1] is broken. Regards! — Preceding unsigned comment added by 81.37.109.54 (talk) 08:24, 24 April 2015 (UTC)
Assessment comment[edit]
The comment(s) below were originally left at Talk:Pencil (geometry)/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
| I was really happy to discover this article because i had
wondered about pencils for some time. Is it possible to provide a precise definition of a pencil in simpler terms? (Here, terms such as "linear series" seem to be bringing in more advanced concepts.) Also, does anybody know a mathematical etymology for the word pencil? |
Last edited at 23:01, 10 May 2009 (UTC). Substituted at 02:27, 5 May 2016 (UTC)
Bundle of lines[edit]
The article cites J.W. Young on one-dimensional primitive forms. The assertion is that a pencil of lines lies in a plane and that the 3D pencil is a bundle. This assertion appears peculiar to Young. In fact, the article geometric primitive does not align with Young's primitive forms. The assertion that a bundle is determined by any three elements is false for a line bundle when the three lines lie in a plane. It is suggested that the article be edited to remove the peculiar notion due to Young. Rgdboer (talk) 21:14, 22 June 2023 (UTC)