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The 0148 <code>\blackbar</code> command makes a bar extending from 10 points below 0149 the baseline to 20 points above. 0150 </p> 0151 <div class="example"> 0152 <pre class="example">\newcommand{\blackbar}{\rule[-10pt]{5pt}{30pt}} 0153 \fbox{\blackbar} 0154 \fbox{\smash{\blackbar}} 0155 </pre></div> 0156 0157 <p>The first box that LaTeX places is 20 points high and 0158 10 points deep. But the second box is treated by LaTeX as 0159 having zero height and zero depth, despite that the ink printed on the 0160 page still extends well above and below the line. 0161 </p> 0162 <p>The <code>\smash</code> command appears often in mathematics to adjust the 0163 size of an element that surrounds a subformula. Here the first radical 0164 extends below the baseline while the second lies just on the baseline. 0165 </p> 0166 <div class="example"> 0167 <pre class="example">\begin{equation} 0168 \sqrt{\sum_{0\leq k< n} f(k)} 0169 \sqrt{\vphantom{\sum}\smash{\sum_{0\leq k< n}} f(k)} 0170 \end{equation} 0171 </pre></div> 0172 0173 <p>Note the use of <code>\vphantom</code> to give the <code>\sqrt</code> command an 0174 argument with the height of the <code>\sum</code> (see <a href="_005cphantom-_0026-_005cvphantom-_0026-_005chphantom.html#g_t_005cphantom-_0026-_005cvphantom-_0026-_005chphantom">\phantom & \vphantom & \hphantom</a>). 0175 </p> 0176 <p>While most often used in mathematics, the <code>\smash</code> command can 0177 appear in other contexts. However, it doesn’t change into horizontal 0178 mode. So if it starts a paragraph then you should first put a 0179 <code>\leavevmode</code>, as in the bottom line below. 0180 </p> 0181 <div class="example"> 0182 <pre class="example">xxx xxx xxx 0183 0184 \smash{yyy} % no paragraph indent 0185 0186 \leavevmode\smash{zzz} % usual paragraph indent 0187 </pre></div> 0188 0189 <a name="index-package_002c-mathtools-4"></a> 0190 <a name="index-mathtools-package-4"></a> 0191 0192 <p>The package <code>mathtools</code> has operators that provide even finer 0193 control over smashing a subformula box. 0194 </p> 0195 0196 0197 0198 <hr/><div class='referenceinfo'> <a href='https://latexref.xyz/'> <i>Unofficial LaTeX2e reference manual</i></a></div> 0199 </body> 0200 </html>