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(From these references no 0018 text was directly copied.) 0019 0020 Copyright 2007, 2008, 2009, 2010, 2011, 2012, 2013, 0021 2014, 2015, 2016, 2017, 2018 Karl Berry. 0022 0023 Copyright 1988, 1994, 2007 Stephen Gilmore. 0024 0025 Copyright 1994, 1995, 1996 Torsten Martinsen. 0026 0027 Permission is granted to make and distribute verbatim copies of 0028 this manual provided the copyright notice and this permission notice 0029 are preserved on all copies. 0030 0031 0032 Permission is granted to copy and distribute modified versions of this 0033 manual under the conditions for verbatim copying, provided that the entire 0034 resulting derived work is distributed under the terms of a permission 0035 notice identical to this one. 0036 0037 Permission is granted to copy and distribute translations of this manual 0038 into another language, under the above conditions for modified versions. --> 0039 <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> 0040 <head> 0041 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 0042 <title>\@ (LaTeX2e unofficial reference manual (November 2018))</title> 0043 0044 <meta name="description" content="\@ (LaTeX2e unofficial reference manual (November 2018))"> 0045 <meta name="keywords" content="\@ (LaTeX2e unofficial reference manual (November 2018))"> 0046 <meta name="resource-type" content="document"> 0047 <meta name="distribution" content="global"> 0048 <meta name="Generator" content="makeinfo"> 0049 <link href="index.html#Top" rel="start" title="Top"> 0050 <link href="IndexDocument.html#Index" rel="index" title="Index"> 0051 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> 0052 <link href="_005cspacefactor.html#g_t_005cspacefactor" rel="up" title="\spacefactor"> 0053 <link href="_005cfrenchspacing.html#g_t_005cfrenchspacing" rel="next" title="\frenchspacing"> 0054 <link href="_005cspacefactor.html#g_t_005cspacefactor" rel="prev" title="\spacefactor"> 0055 <style type="text/css"> 0056 <!-- 0057 /* $Id: latex2e.css 690 2018-09-15 15:20:19Z jimhefferon $ 0058 Minor css for latexrefman. Public domain. 0059 Originally written by Jim Hefferon and Karl Berry, 2018. */ 0060 0061 /* So you can style for yourself */ 0062 @import url("/css/latexreflocal.css"); 0063 0064 0065 0066 a.summary-letter {text-decoration: none} 0067 blockquote.indentedblock {margin-right: 0em} 0068 blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} 0069 blockquote.smallquotation {font-size: smaller} 0070 div.display {margin-left: 3.2em} 0071 div.example {margin-left: 3.2em} 0072 div.lisp {margin-left: 3.2em} 0073 div.smalldisplay {margin-left: 3.2em} 0074 div.smallexample {margin-left: 3.2em} 0075 div.smalllisp {margin-left: 3.2em} 0076 kbd {font-style: oblique} 0077 pre.display {font-family: inherit} 0078 pre.format {font-family: inherit} 0079 pre.menu-comment {font-family: serif} 0080 pre.menu-preformatted {font-family: serif} 0081 pre.smalldisplay {font-family: inherit; font-size: smaller} 0082 pre.smallexample {font-size: smaller} 0083 pre.smallformat {font-family: inherit; font-size: smaller} 0084 pre.smalllisp {font-size: smaller} 0085 span.nolinebreak {white-space: nowrap} 0086 span.roman {font-family: initial; font-weight: normal} 0087 span.sansserif {font-family: sans-serif; font-weight: normal} 0088 ul.no-bullet {list-style: none} 0089 BODY { 0090 margin-top: 1em; 0091 margin-left: 1em; /* auto results in two-digit <ol> lost off left */ 0092 margin-right: 1em; 0093 margin-bottom: 1em; 0094 /* the idea is to use the whole window, unless it is ridiculously 0095 wide, probably with too-small fonts, too. */ 0096 max-width: 64em; 0097 } 0098 0099 /* Because we want @math{... @code ...} to be upright, not slanted, 0100 and Texinfo won't fix it. */ 0101 code {font-style:normal; font-family:monospace; } 0102 0103 /* We put a link to our own home page at the bottom. */ 0104 div.referenceinfo {font-size:small;} 0105 0106 --> 0107 </style> 0108 0109 0110 </head> 0111 0112 <body lang="en"> 0113 <a name="g_t_005c_0040"></a> 0114 <div class="header"> 0115 <p> 0116 Next: <a href="_005cfrenchspacing.html#g_t_005cfrenchspacing" accesskey="n" rel="next">\frenchspacing</a>, Up: <a href="_005cspacefactor.html#g_t_005cspacefactor" accesskey="u" rel="up">\spacefactor</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="IndexDocument.html#Index" title="Index" rel="index">Index</a>]</p> 0117 </div> 0118 <hr> 0119 <a name="g_t_005c_0040-1"></a> 0120 <h4 class="subsection">19.5.1 <code>\@</code></h4> 0121 0122 <a name="index-_005c_0040"></a> 0123 <a name="index-at_002dsign"></a> 0124 <a name="index-period_002c-sentence_002dending"></a> 0125 <a name="index-period_002c-abbreviation_002dending"></a> 0126 <a name="index-period_002c-spacing-after"></a> 0127 <a name="g_t_005cAT"></a> 0128 <p>Synopsis: 0129 </p> 0130 <div class="example"> 0131 <pre class="example"><var>capital-letter</var>\@. 0132 </pre></div> 0133 0134 <p>Treat a period as sentence-ending, where LaTeX would otherwise think 0135 it is part of an abbreviation. LaTeX thinks that a period ends an 0136 abbreviation if the period comes after a capital letter, and otherwise 0137 thinks the period ends the sentence. By default, in justifying a line 0138 LaTeX adjusts the space after a sentence-ending period (or a question 0139 mark, exclamation point, comma, or colon) more than it adjusts the space 0140 between words (see <a href="_005cspacefactor.html#g_t_005cspacefactor">\spacefactor</a>). 0141 </p> 0142 <p>This example shows the two cases to remember. 0143 </p> 0144 <div class="example"> 0145 <pre class="example">The songs \textit{Red Guitar}, etc.\ are by Loudon Wainwright~III\@. 0146 </pre></div> 0147 0148 <p>The second period ends the sentence, despite that it is preceded by a 0149 capital. We tell LaTeX that it ends the sentence by putting 0150 <code>\@</code> before it. The first period ends the abbreviation 0151 ‘<samp>etc.</samp>’ but not the sentence. The backslash-space, <code>\ </code>, 0152 produces a mid-sentence space. 0153 </p> 0154 <p>So: if you have a capital letter followed by a period that ends the 0155 sentence, then put <code>\@</code> before the period. This holds even if 0156 there is an intervening right parenthesis or bracket, or right single or 0157 double quote, because the spacing effect of that period carries through 0158 those characters. For example, this 0159 </p> 0160 <div class="example"> 0161 <pre class="example">Use the \textit{Instructional Practices Guide}, 0162 (a book by the MAA)\@. 0163 </pre></div> 0164 0165 <p>will have correct inter-sentence spacing after the period. 0166 </p> 0167 <p>The <code>\@</code> command is only for a text mode. If you use it outside of 0168 a text mode then you get ‘<samp>You can't use `\spacefactor' in vertical 0169 mode</samp>’ (see <a href="Modes.html#Modes">Modes</a>). 0170 </p> 0171 <p>Comment: the converse case is a period ending an abbreviation whose last 0172 letter is not a capital letter, and that abbreviation is not the last 0173 word in the sentence. For that case follow the period with a 0174 backslash-space, (<code>\ </code>), or a tie, (<code>~</code>), or <code>\@</code>. 0175 Examples are <code>Nat.\ Acad.\ Science</code>, and <code>Mr.~Bean</code>, and 0176 <code>(manure, etc.\@) for sale</code> (note in the last one that the 0177 <code>\@</code> comes before the closing parenthesis). 0178 </p> 0179 0180 0181 0182 <hr/><div class='referenceinfo'> <a href='https://latexref.xyz/'> <i>Unofficial LaTeX2e reference manual</i></a></div> 0183 </body> 0184 </html>