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<a name="Mathematics"></a>
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<a name="Entering-Mathematics"></a>
<h2 class="section">2.5 Entering Mathematics</h2>
<a name="index-Mathematics"></a>
<a name="index-Symbols"></a>
<a name="index-Abbreviations"></a>
<p>TeX is written by a mathematician, and has always contained good
support for formatting mathematical text. AUCTeX supports this
tradition, by offering a special minor mode for entering text with many
mathematical symbols. You can enter this mode by typing <kbd>C-c
~</kbd>.
</p>
<dl>
<dt><a name="index-LaTeX_002dmath_002dmode"></a><u>Command:</u> <b>LaTeX-math-mode</b></dt>
<dd><a name="index-C_002dc-_007e"></a>
<p>(<kbd>C-c ~</kbd>) Toggle LaTeX Math mode. This is a minor mode rebinding
the key <code>LaTeX-math-abbrev-prefix</code> to allow easy typing of
mathematical symbols. <kbd>`</kbd> will read a character from the keyboard,
and insert the symbol as specified in <code>LaTeX-math-default</code> and
<code>LaTeX-math-list</code>. If given a prefix argument, the symbol will be
surrounded by dollar signs.
</p></dd></dl>
<p>You can use another prefix key (instead of <kbd>`</kbd>) by setting the
variable <code>LaTeX-math-abbrev-prefix</code>.
</p>
<p>To enable LaTeX Math mode by default, add the following in your
‘<tt>.emacs</tt>’ file:
</p><table><tr><td> </td><td><pre class="lisp">(add-hook 'LaTeX-mode-hook 'LaTeX-math-mode)
</pre></td></tr></table>
<dl>
<dt><a name="index-LaTeX_002dmath_002dabbrev_002dprefix"></a><u>User Option:</u> <b>LaTeX-math-abbrev-prefix</b></dt>
<dd><p>A string containing the prefix of <code>LaTeX-math-mode</code> commands; This
value defaults to <kbd>`</kbd>.
</p>
<p>The string has to be a key or key sequence in a format understood by the
<code>kbd</code> macro. This corresponds to the syntax usually used in the
manuals for Emacs Emacs Lisp.
</p></dd></dl>
<p>The variable <code>LaTeX-math-list</code> allows you to add your own mappings.
</p>
<dl>
<dt><a name="index-LaTeX_002dmath_002dlist"></a><u>User Option:</u> <b>LaTeX-math-list</b></dt>
<dd><p>A list containing user-defined keys and commands to be used in LaTeX
Math mode. Each entry should be a list of two to four elements.
</p>
<p>First, the key to be used after <code>LaTeX-math-abbrev-prefix</code> for
macro insertion. If it is nil, the symbol has no associated
keystroke (it is available in the menu, though).
</p>
<p>Second, a string representing the name of the macro (without a leading
backslash.)
</p>
<p>Third, a string representing the name of a submenu the command should be
added to. Use a list of strings in case of nested menus.
</p>
<p>Fourth, the position of a Unicode character to be displayed in the menu
alongside the macro name. This is an integer value.
</p></dd></dl>
<dl>
<dt><a name="index-LaTeX_002dmath_002dmenu_002dunicode"></a><u>User Option:</u> <b>LaTeX-math-menu-unicode</b></dt>
<dd><p>Whether the LaTeX menu should try using Unicode for effect. Your Emacs
built must be able to display include Unicode characters in menus for
this feature.
</p></dd></dl>
<p>AUCTeX’s reference card ‘<tt>tex-ref.tex</tt>’ includes a list of all
math mode commands.
</p>
<p>AUCTeX can help you write subscripts and superscripts in math
constructs by automatically inserting a pair of braces after typing
<_> or <^> respectively and putting point between the braces.
In order to enable this feature, set the variable
<code>TeX-electric-sub-and-superscript</code> to a non-nil value.
</p>
<dl>
<dt><a name="index-TeX_002delectric_002dsub_002dand_002dsuperscript"></a><u>User Option:</u> <b>TeX-electric-sub-and-superscript</b></dt>
<dd><p>If non-nil, insert braces after typing <^> and <_> in math mode.
</p></dd></dl>
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