Talk:Shape

message: "In other words, the shape of a set is all the geometrical information that is invariant to location, scale and rotation."  You have got to be kidding. First of all, this isn't much of a definition, in that it tells what shape is not, rather than what it is. Second, it's a bit technical in the introduction. Please fix. 71.102.186.234 01:30, 30 November 2006 (UTC)
thread_title: Definition

message: This article is still very week here's a few thoughts on a new section
===Descriptive names for shapes===
A variety of descriptives names have been used to describe shapes, these are often in comparison with well know objects. Frequently there are many different objects which fit each class
;Geometrical shapes
*triangular - 
*rectangular - 
*square - 
*Cylindrical
*Conical
*Spherical
*Circular
*Spiral (or helical)
;Letter like shapes
*L-shaped, S-shaped (sigmoid), T-shaped, U-shaped, V-shaped, (crossed shaped) X-shaped
;Comparison with everyday objects
*Hourglass shapes
*Figure-8 shaped
*Teardrop
*Bell shaped
*Star shaped
*Doughnut (with a hole i.e. toroidal)
===Global and local properties of a shape===
It is also common to describe one aspect of a shape as a whole.
The sign of the Gaussian curvature can be used to describe an aspect of the local shape
*Convex - positive Gaussian curvature
*Flat - zero Gaussian curvature
*Saddle-shaped - negative Gaussian curvature
*Concave
*Symmetrical, generally refers to mirror symmetry
*polygonal
*polyhedral
===Shape invariants===
Certain points and curves on an object will be invariant under rotation, scaling and translation
*inflections of plane curves (when the curvature is zero)
*vertices of plane curves (where the curvature has a local minimum or maximum)
*parabolic lines of a surface (when Gaussian curvature is zero)
*ridges (local extremum of principal curvature)
Topological properties are also invariant under a wider class of transformations
--Salix alba (talk) 13:53, 1 February 2007 (UTC)
replies: text: That's fine with me, as long as the extra details appear in sections towards the bottom. And a hint: use a browser with spell-checker, like recent versions of Firefox. :) Oleg Alexandrov (talk) 16:01, 1 February 2007 (UTC)
replies: text: Point taken about the spelling, it needs a lot of fleshing out, basicially just a half hour brainstorm. GHope to work on this a bit more in the next couple of days. --Salix alba (talk) 00:14, 2 February 2007 (UTC)

text: I disagree with the merger. That article is much bigger than this one and all  that listcruft would overwhelm this article. I would agree with moving here a minimal list of most important shapes rather than the whole list. Or otherwise I think that article better stay separate or get deleted. Oleg Alexandrov (talk) 15:59, 9 February 2007 (UTC)
replies: text: I proposed the deletion of the "metaphorical" article; I'd be just as happy with a consensus to make it a redirect, and quarry its history here. Septentrionalis PMAnderson 03:40, 10 February 2007 (UTC)
thread_title:  Describing shapes 

message: Certain points and curves on an object will be invariant under rotation, scaling and translation
*inflections of plane curves (when the curvature is zero)
*vertices of plane curves (where the curvature has a local minimum or maximum)
*parabolic lines of a surface (when Gaussian curvature is zero)
*ridges (local extremum of principal curvature)
Topological properties are also invariant under a wider class of transformations
--Salix alba (talk) 13:53, 1 February 2007 (UTC)
replies: text: That's fine with me, as long as the extra details appear in sections towards the bottom. And a hint: use a browser with spell-checker, like recent versions of Firefox. :) Oleg Alexandrov (talk) 16:01, 1 February 2007 (UTC)
replies: text: Point taken about the spelling, it needs a lot of fleshing out, basicially just a half hour brainstorm. GHope to work on this a bit more in the next couple of days. --Salix alba (talk) 00:14, 2 February 2007 (UTC)
thread_title: Shape invariants

message: Salix Alba is essentially proposing this merger above; and it was supported at Wikipedia:Articles for deletion/Glossary of shapes with metaphorical names; so was deleting that list. The declared purpose of the list (having some place for V-shaped to redirect to) can as well be served by this article; and it may produce lesss of an indiscriminate collection of information. Septentrionalis PMAnderson 05:32, 9 February 2007 (UTC)
replies: text: I disagree with the merger. That article is much bigger than this one and all  that listcruft would overwhelm this article. I would agree with moving here a minimal list of most important shapes rather than the whole list. Or otherwise I think that article better stay separate or get deleted. Oleg Alexandrov (talk) 15:59, 9 February 2007 (UTC)
replies: text: I proposed the deletion of the "metaphorical" article; I'd be just as happy with a consensus to make it a redirect, and quarry its history here. Septentrionalis PMAnderson 03:40, 10 February 2007 (UTC)
thread_title: Merge

message: how can this article be both low priority, start quality, and vital: we have to put in the CD or what not, it's barely better than a stub, and it's not very important? how does that work? Saganatsu (talk) 02:27, 20 December 2007 (UTC)
thread_title:  low&vital 

message: kudh yl hhiera uireh aurt n  —Preceding unsigned comment added by 65.48.165.150 (talk) 16:09, 5 October 2008 (UTC)
thread_title:  Shape as a element of art 

message: It might be nice to add a group picture of the more common geometric shapes.  Or perhaps two images - one for 2D shapes (square, rectangle, triangle, circle, rhombus, etc) and one for 3D shapes (cube, rectangle, cone, sphere, etc).  —Preceding unsigned comment added by 81.156.126.242 (talk) 19:30, 17 August 2009 (UTC)
thread_title:  A Group Picture? 

message: I was under the impression that, in geometry, shapes are 2-dimensional but figures are 3-dimensional.  This article refers to just about anything as a "shape."  In fact, in the Introduction section the phrase "plane figure" is a hyperlink back to this article--thus, completely useless!  Please help.  MorbidAnatomy (talk) 20:15, 20 March 2011 (UTC)
thread_title:  Shape v. Figure 

message: Substituted at 05:53, 30 April 2016 (UTC)
thread_title: Assessment comment

message: 3-D shapes are? 69.79.12.153 (talk) 22:35, 30 December 2022 (UTC)
thread_title:  Mathematics 

message: View the proposal here. Writehydra (talk) 05:00, 2 February 2024 (UTC)
thread_title:  Geometry WikiProject proposal