Talk:Necessary and sufficient

From Citizendium
Revision as of 04:36, 2 February 2010 by imported>Peter Schmitt (→‎Circle)
Jump to navigation Jump to search
This article is developed but not approved.
 Main Article
 Discussion
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
 
To learn how to update the categories for this article, see here. To update categories, edit the metadata template.
 Definition:  In mathematics, a frequently used phrase to say that two statements are logically equivalent. [d] [e]
Checklist and Archives
 Workgroup category:  Mathematics [Please add or review categories]
 Talk Archive:  none  English language variant:  British English

Circle

"A circle (in the plane) is usually defined as a curve such that its points all have the same distance from a given point" — a bit problematic; say, half a circle, is it also a circle? It IS "a curve such that its points all have the same distance from a given point", isn't it? Boris Tsirelson 10:05, 2 February 2010 (UTC)

True, of course. I wanted to keep this colloquial, and there this distinction is usually not made. (It holds for both characterizations.) And since I did not think of the formulation I found now ...
By the way: Boris, do you think (agree) that this topic is worth a page (for non-mathematicians) like this?
--Peter Schmitt 10:36, 2 February 2010 (UTC)
Retrieved from "https://citizendium.org/wiki/index.php?title=Talk:Necessary_and_sufficient&oldid=720952"