Ellipses are commonly required, and LaTeX natively supplies a fair
range (`\dots`

, `\cdots`

, `\vdots`

and `\ddots`

). By using
the *graphics* package, one can change the slope of the
`\ddots`

command, as in

While this works, it is not a recommended way of achieving the desired result (see below). Moreover, LaTeX’s range is not adequate to everyone’s requirements, and at least three packages provide extensions to the set.$ ... \reflectbox{$\ddots$} ... $

The AMSLaTeX bundle provides a range of “semantically-named”
ellipses, for use in different situations: `\dotsb`

for use between
pairs of binary operators, `\dotsc`

for use between pairs of commas,
and so on.

The *yhmath* package defines an `\adots`

command, which is
the analogue of `\ddots`

, sloping forwards rather than backwards.
The *yhmath* package comes with a rather interesting font that
extends the standard *cmex*; details are in the documentation.

The *mathdots* package (besides fixing up the behaviour of
(La)TeX `\ddots`

and `\vdots`

when the font size changes)
provides an “inverse diagonal” ellipsis `\iddots`

(doing the same
job as *yhmath*’s `\adots`

, but better).

Documentation of *yhmath* appears, processed, in the
distribution (thus saving you the bother of installing the package
before being able to read the documentation). Documentation of
*mathdots* appears at the end the package file itself.

- amslatex
- amslatex
- graphics.sty
- Part of the graphics bundle
- mathdots.sty
- mathdots
- yhmath
- yhmath

This answer last edited: 2013-08-21

This question on the Web: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=mathlips