Talk:Element (mathematics)

message: Is there a Unicode for "is element of" and "is not element of"? --137.193.16.78 19:57, 30 August 2007 (UTC)
replies: text: Yes, U+2208 is ∈, U+2209 is ∉, U+220B is ∋, and U+220C is ∌. - MTC 12:14, 8 October 2007 (UTC)
thread_title:  Unicode? 

message: What about membership in multisets? For a particular element (or not-element) it can be true or false, but the membership can also be given a quantity, as the multiset article says:
A member of a multiset can have more than one membership. --Abdull (talk) 16:55, 2 February 2008 (UTC)
thread_title:  Membership in multisets 

message: Where does this symbol meaning "is a member of", which looks a bit like the sign for the Euro currency, come from?  Does it have a name?  — Preceding unsigned comment added by 86.132.16.81 (talk) 16:29, 14 April 2013 (UTC)
replies: text: It's a stylised lower case epsilon. It was first used for set membership by Peano who chose it because it is the first letter of the latin word est, meaning "is". 176.253.168.123 (talk) 22:22, 24 November 2013 (UTC)
thread_title:  Origin 

message: An element is distinct, is the statement. So {1,1,1,2,2,3,3,3,3} isn't a set???? Or how about {1,2} and {2,1}: same set or different set??
Seems to me that (unless the set is ordered) the answer to my second question is "same" and the answer to my first question is "it depends".  the set which contains the integer which is one greater than zero and the integer which is one less than two has one element, while the values of two observations may indeed form the set {1,1} (with some implicit measurement unit). This article does an absolutely miserable job of defining (or explaining, if you're of the school that believes some concepts are fundamental and can't be further reduced) what it is about.173.189.78.173 (talk) 05:44, 22 April 2015 (UTC)
thread_title:  Really lousy definition 

message: "The elements of a set can be anything. For example, C = \{\mathrm{\color{red}red}, \mathrm{\color{green}green}, \mathrm{\color{blue}blue}\}, is the set whose elements are the colors ,  and ."
What is this special formatting supposed to indicate? For me it draws attention to the ambiguity of convention; elements of set C appear to be three words, not three colours. Or is it a commonly understood mathematical convention that only the name of a colour formatted in that colour represents the concept of that colour? In that case, what does the word "red" formatted in normal black text represent? In short, I would really find more plainly put if this fragment read 
"For example, C = \{\mathrm{red}, \mathrm{green}, \mathrm{blue}\}, is the set whose elements are the colors red, green, and blue." (The normal way these words are used), or if we're worried readers won't know that the word red refers to the colour red, etc., we can link each word to the appropriate article about the colour. Or if we truly want to drive home the point that any and all elements are admissible, why not pick a truly disparate set?
For example, M = \{\mathrm{red}, \mathrm{2}, \mathrm{whale}\}, is the set whose elements are the colour red, the number 2, and the animal whale."
Orbis 3 (talk) 08:27, 19 November 2017 (UTC)
replies: text: I agree. Paul August ☎ 17:06, 19 November 2017 (UTC)
thread_title:  Set of colours 

message: A discussion is taking place to address the redirect ⋲. The discussion will occur at Wikipedia:Redirects for discussion/Log/2020 May 9#⋲ until a consensus is reached, and readers of this page are welcome to contribute to the discussion.  1234qwer1234qwer4 (talk) 17:07, 9 May 2020 (UTC)
thread_title:  "⋲" listed at [[Wikipedia:Redirects for discussion|Redirects for discussion]] 

message: A discussion is taking place to address the redirect ⋳. The discussion will occur at Wikipedia:Redirects for discussion/Log/2020 May 9#⋳ until a consensus is reached, and readers of this page are welcome to contribute to the discussion.  1234qwer1234qwer4 (talk) 17:08, 9 May 2020 (UTC)
thread_title:  "⋳" listed at [[Wikipedia:Redirects for discussion|Redirects for discussion]] 

message: A discussion is taking place to address the redirect ⋴. The discussion will occur at Wikipedia:Redirects for discussion/Log/2020 May 9#⋴ until a consensus is reached, and readers of this page are welcome to contribute to the discussion.  1234qwer1234qwer4 (talk) 17:10, 9 May 2020 (UTC)
thread_title:  "⋴" listed at [[Wikipedia:Redirects for discussion|Redirects for discussion]] 

message: A discussion is taking place to address the redirect ⋵. The discussion will occur at Wikipedia:Redirects for discussion/Log/2020 May 9#⋵ until a consensus is reached, and readers of this page are welcome to contribute to the discussion.  1234qwer1234qwer4 (talk) 17:10, 9 May 2020 (UTC)
thread_title:  "⋵" listed at [[Wikipedia:Redirects for discussion|Redirects for discussion]] 

message: Lockout 2409:4071:2080:29:367A:A668:823A:FBFE (talk) 00:47, 1 December 2021 (UTC)
thread_title:  Maths 

message: How come there is no discussion here, in this article, of the word "elements" as in the title of the book by Euclid, or Euclid's Elements, or Elements?  — Preceding unsigned comment added by 71.183.110.20 (talk) 05:54, 22 November 2022 (UTC)
thread_title:  Elements