### Hypertext Help with LaTeX

# Binary and relational operators

Some "math" symbols are obtained by typing the corresponding keyboard
character. Examples include
+ - = < >

**Note:** plus, minus, and equal sign may be used in
either text or math mode, but < and > are math mode only
(they produce inverted exclamation and question marks, respectively,
in text mode).
The following commands may be used only in math mode.

`\pm` plus or minus sign
`\mp` minus or plus sign
`\times` times (an "x")
`\div` divided by sign
`\ast` an asterisk (centered)
`\star` a five-point star (centered)
`\bullet` a bullet
`\circ` an open bullet
`\cdot` a centered dot (see also,
`\cdots`)

`\leq` less than or equal to
`\ll` much less than
`\subset` is a subset of
`\geq` greater than or equal to
`\gg` much greater than
`\equiv` equivalence symbol
`\sim` similar to
`\simeq` similar or equal to
`\approx` approximately equal to
`\neq` not equal to
`\per` "perpendicular to" symbols
`\propto` proportional to

Note that "greater than" and "less than" are obtained simply by
entering `>` and `<`.

A slash, indicating "not" can be placed through a symbol
(or a letter) with the `\not` command. For example, not less than is

\not<

and not less than or equal to is
\not\leq

If the slash isn't properly positioned it can be moved by putting a
math mode spacing command between the `\not`
and the symbol.
Related topics:

See also Math Formulas,
Math Symbols

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Revised: Sheldon Green, 7Jul 1995.