<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Bruno et al,<div><br></div><div>This is precisely what I needed. But now I think I also need an explanation. We have:</div><div><br></div><div>\begin{alignat}{5}</div><div><br></div><div>But the first row has 9 ampersands. I've stumbled into solutions like this on my own, but I just don't understand the use of the ampersands. Is this use of the ampersands explained in any documentation?</div><div><br></div><div>D.</div><div><br></div><div>P.S. Also, is there any way to spread out the output a bit? </div><div><br></div><div>D.</div><div><br></div><div><br></div><div><div><div>On Apr 17, 2011, at 12:56 PM, Bruno Voisin wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>Le 17 avr. 2011 à 21:48, Lee D. Witt a écrit :</div><blockquote type="cite"><p>Have you tried "alignat"? You specify the number of "columns" to align. If you want to align n columns use 2n-1 &s</p>
</blockquote><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 13px/normal Monaco; ">\begin{alignat}{5}</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 13px/normal Monaco; ">u &=0 & \quad\text{or}\quad && u+4 &=0 & \quad\text{or}\quad && u-4 &=0 \\</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 13px/normal Monaco; ">u &=0 &&& u &=-4 &&& u &=4 \\</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 13px/normal Monaco; ">\log x &=0 &&& \log x &=-4 &&& \log x &=4</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 13px/normal Monaco; ">\end{alignat}</div><div><br></div><div>Bruno</div></div><br></div>----------- Please Consult the Following Before Posting -----------<br>TeX FAQ: <a href="http://www.tex.ac.uk/faq">http://www.tex.ac.uk/faq</a><br>List Reminders and Etiquette: <a href="http://email.esm.psu.edu/mac-tex/">http://email.esm.psu.edu/mac-tex/</a><br>List Archive: <a href="http://tug.org/pipermail/macostex-archives/">http://tug.org/pipermail/macostex-archives/</a><br>TeX on Mac OS X Website: <a href="http://mactex-wiki.tug.org/">http://mactex-wiki.tug.org/</a><br>List Info: <a href="http://email.esm.psu.edu/mailman/listinfo/macosx-tex">http://email.esm.psu.edu/mailman/listinfo/macosx-tex</a><br><br></blockquote></div><br></div></body></html>