Symbols:Set Theory/Element

Element

$\in$

Let $S$ be a set.

An element of $S$ is a member of $S$.

The $\LaTeX$ code for \(x \in S\) is x \in S .

Negation

$\notin$

To denote the statement that $x$ is not an element of a set $S$, we can write:

$x \notin S$

The $\LaTeX$ code for \(x \notin S\) is x \notin S .

Sources

• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): Appendix: Table $7$: Common signs and symbols: set
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): Appendix $14$: Symbols