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Not An Element Of Symbol ∉

In mathematical notation, the symbol "∉" represents the "not an element of" relation, indicating that a particular element does not belong to a set. This is a logical negation of the "element of" relation (∈) and signifies the exclusion of an element from a specified set.

Definition

The "not an element of" relation is denoted by the symbol "∉," and it is read as "is not an element of" or "does not belong to." For example, if an element x is not in a set A, it is written as x ∉ A, indicating that x is not a member of the set A.

Representation in HTML

In HTML, the "not an element of" symbol can be represented using the HTML entity ∉.

Usage in Mathematics

The "not an element of" relation is fundamental in set theory and mathematical logic. It allows mathematicians to explicitly state that a particular element is excluded from a given set, contributing to the precision of mathematical statements.

Example

An example of the "not an element of" relation is: "7 ∉ {1, 2, 3, 4, 5}." This statement reads as "7 is not an element of the set {1, 2, 3, 4, 5}," expressing the absence of the number 7 in the specified set.

Set Notation

Set notation often employs the "not an element of" symbol to describe exclusions in sets. For instance, if B is the set of even numbers, it can be written as B = {x | x ∈ ℤ, x is even}, indicating that every element in B is an even integer.

 

The "not an element of" relation is a crucial element in mathematical notation, providing a concise and precise way to express the exclusion of elements from sets. Its use enhances the clarity and rigor of mathematical statements, allowing mathematicians to define and analyze collections of elements with precision.

Not An Element Of Symbol Information

Symbol Name
Not An Element Of
Unicode Version
1.1 (June 1993)
Unicode
U+2209
CSS Code
\2209
HTML Entity
∉
Hex Code
∉
HTML Code
∉
Latex
\not\in
Symbol
∉

Not An Element Of Symbol Encoding

UTF-8
0xE2 0x88 0x89
UTF-16
0x2209
UTF-32
0x00002209

Not An Element OfSymbol's PNG and SVG files

Not An Element Of symbol png image
Not An Element Of symbol svg image

Not An Element Of Symbol in Latex

Not An Element Of
1\documentclass{article} 2\begin{document} 3\not\in 4\end{document}

How to add not an element of symbol via keyboard on different Operating systems

You can type the not an element of symbol on most modern devices with the help of following methods:

How to type not an element of symbol on Microsoft Word

You can type the not an element of in Microsoft Word using steps mentioned below:

  • Place your cursor in the text area where you need to insert the symbol and type 2209
  • Without moving the cursor press keys Alt + x together
  • The original 2209 is now transformed into ∉

How to type not an element of symbol on Microsoft Windows

You can type the not an element of on Microsoft windows using following steps:

  • Hold Alt and press to type not an element of on your windows machine.

How to type not an element of symbol on Mac OS

You can type the not an element of on Mac OS using following steps:

  • Place your cursor in the text area where you need to insert the symbol
  • Press Ctrl + ⌘ Command + ⎵ Space to bring up the Character Viewer. Alternatively, choose Edit ⇒ Emoji & Symbols
  • Type "Not An Element Of" in the search field at the top and press Enter
  • The symbol should appear. Click on it to insert it into your text
Mac OS Character Viewer
Mac OS Character Viewer

How to type not an element of symbol on Linux

You can type the not an element of on Linux using following steps:

  • Place your cursor in the text area where you need to insert the symbol
  • Hold ⇧ Shift + Ctrl and press the letter + U
  • Press keys 2209 consecutively
  • And then press ↵ Enter , the desired symbol will be added to your document

How to type not an element of symbol on IOS and Android

The easiest way to type the not an element of symbol on ios and android is to copy and paste it wherever you need it.

How to use not an element of in CSS

//CSS Example
1span { 2 content: \2209; 3 }

How to use not an element of in HTML

//HTML Example
1<span>&#8713;</span>

Not An Element Of symbol representation in programming languages

Not An Element Ofsymbol's representation in different programming languages can be found in table below:

LanguageRepresentation
Rust
\u{2209}
Ruby
\u{2209}
Python
\u2209
PHP
\u{2209}
Perl
\x{2209}
Java
\u2209
Modern JavaScript - Since ES6
\u{2209}
JavaScript
\u2209
Go
\u2209
C#
\u2209
C and C++
\u2209
Bash and Zsh - inside echo -e
\u2209
RFC 5137
\u'2209'