Symbols

Numbers and Variables

• Variables (or letters) are automatically displayed in a font that is much italicized than normal font used to display text.
  • This gives it a more, classic mathematical look.

• By convention, numbers are automatically displayed in an upright font to distinguish them from variables with an italicized font.

Operators and Symbols

• We often use operators to describe relationships between variables.
• Some of these symbols that cannot be found in the keyboard now use special names using backslash commands \{...}
  • For example, typing the command \times will output the multiplication symbol .
  • As an another example, the command \div will give us the division symbol .
• A smaller list of symbols can be found here.
  Click here to view all symbols supported by KaTEX.

Symbol	Command	Description	Example	Output
	+	plus symbol	2 + 3 + 5
	-	minus symbol	- 3
	\times	multiplication symbol	5 \times 2
	\div	division symbol	6 \div 0
	\cdot	center dot	a \cdot b \ cdot c
	\cdots	center ellipsis	2 \times 2 \times \cdots \times 2
	\ldots	lower ellipsis	1, 2, 3, 4, \ldots, 100
	=	equal	1 + 2 = 3
	\ne	not equal	a(a+b) \ne 2a + b
	> or \gt	greater than	a \gt b
	< or \lt	less than	a \lt b
	\ge	greater than or equal	a \ge b
	\le	less than or equal	a \le b
	( and )	parentheses	(a + b) + c = a + (b + c)
	[ and ]	square brackets	[(9 \times 3) + 1] \div 2
	\in	in	a \in S
	\cup	union	(A \cup B) \cup C
	\cap	intersection	U \cap A = A
	\circ	function composition	(f \circ g)(x)
	\pm	plus or minus	x \pm c
	\mp	minus or plus	- (\mp c - x)
	\forall	for all
	\therefore	therefore
	\exists	exists
	\to	to
	\land	logical AND
	\lor	logical OR
	\neg or \lnot	logical NOT
	\emptyset	empty set
	\subset	subset
	\infty	infinity