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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText><a name="_MailEndCompose">I creates short text which creates for me problem during compilation.<o:p></o:p></a></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><b><span style='color:#365F91'>\documentclass{amsbook}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\usepackage[unicode]{hyperref}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\renewcommand\theHchapter{E.\arabic{chapter}}%<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\numberwithin{section}{chapter}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\newtheorem{theorem}{Theorem}[section]<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\makeatletter<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\newcommand\StartLabelItem[1][theorem]%<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>{<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>%\counterwithin{enumi}{#1}%<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\expandafter \def \csname%<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'> theenumi\expandafter \endcsname \expandafter {\csname the#1\expandafter%<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'> \endcsname.\expandafter \@arabic \csname c@enumi\endcsname }%<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\def\labelenumi{\theenumi:}%<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\usepackage{paracol}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\globalcounter{theorem}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\globalcounter{enumi}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\makeatother<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'><o:p> </o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\begin{document}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\chapter{C One}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\section{S One}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\begin{paracol}{2}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\begin{theorem}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\label{theorem one}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>abc<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\StartLabelItem<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\begin{enumerate}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\item<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>the one<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\label{item one}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\item<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>the two<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\label{item two}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\end{enumerate}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\end{theorem}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\switchcolumn<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\begin{theorem}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\label{theorem two}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>abc<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\StartLabelItem<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\begin{enumerate}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\item<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>the one<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\label{item one a}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\item<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>the two<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\label{item two a}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\end{enumerate}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\end{theorem}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\end{paracol}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\end{document}<o:p></o:p></span></b></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>When I compile this text, I get error <o:p></o:p></p><p class=MsoPlainText><span style='color:red'>pdfTeX warning (ext4): destination with the same identifier (name{Item.1}) has <o:p></o:p></span></p><p class=MsoPlainText><span style='color:red'>been already used, duplicate ignored<o:p></o:p></span></p><p class=MsoPlainText>My first impression was that report of error was mistake because all references work properly. But when I looked in aux file I saw following<o:p></o:p></p><p class=MsoPlainText><b><span style='color:#365F91'>\newlabel{theorem one}{{1.1.1}{1}{}{theorem.E.1.1.1}{}}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\newlabel{item one}{{1.1.1.1}{1}{}{Item.1}{}}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\newlabel{item two}{{1.1.1.2}{1}{}{Item.2}{}}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\newlabel{theorem two}{{1.1.2}{1}{}{theorem.E.1.1.2}{}}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\newlabel{item one a}{{1.1.2.1}{1}{}{Item.1}{}}<o:p></o:p></span></b></p><p class=MsoPlainText><b><span style='color:#365F91'>\newlabel{item two a}{{1.1.2.2}{1}{}{Item.2}{}}<o:p></o:p></span></b></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>In my original code instead of item.1 and item.2 was reference to number of theorem, and it postponed to later code which made harder to find source of problem. So to fix the problem, I need to make sure that last 2 lines has item.3 and item.4<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>The question is how I can do it<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Thank you<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'>Aleks Kleyn</span><span style='color:#1F497D'><o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 style='border-collapse:collapse'><tr><td width=734 valign=top style='width:275.4pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal style='line-height:115%'><a href="http://alekskleyn.dyndns-home.com:4080/"><span style='font-size:10.5pt;line-height:115%;font-family:Consolas;color:blue'>http://alekskleyn.dyndns-home.com:4080/</span></a><span style='font-size:10.5pt;line-height:115%;font-family:Consolas;color:#1F497D'> </span><span style='font-size:12.0pt;line-height:115%;color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='line-height:115%'><a href="http://sites.google.com/site/alekskleyn/"><span style='font-size:10.5pt;line-height:115%;font-family:Consolas;color:blue'>http://sites.google.com/site/AleksKleyn/</span></a><span style='font-size:10.5pt;line-height:115%;font-family:Consolas;color:#1F497D'> </span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='line-height:115%'><a href="http://arxiv.org/a/kleyn_a_1"><span style='font-size:10.5pt;line-height:115%;font-family:Consolas;color:blue'>http://arxiv.org/a/kleyn_a_1</span></a><span style='font-size:10.5pt;line-height:115%;font-family:Consolas;color:#1F497D'> </span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='line-height:115%'><a href="http://AleksKleyn.blogspot.com/"><span style='font-size:10.5pt;line-height:115%;font-family:Consolas;color:blue'>http://AleksKleyn.blogspot.com/</span></a><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='line-height:115%'><a href="http://kleynaleks.blogspot.com/"><span style='font-size:10.5pt;line-height:115%;font-family:Consolas;color:blue'>http://KleynAleks.blogspot.com/</span></a><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='line-height:115%'><span style='font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";color:#1F497D'><o:p> </o:p></span></p></td><td width=466 valign=top style='width:174.85pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal style='line-height:115%'><span style='color:#1F497D'>Derivative in Banach algebra</span><span style='font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";color:#1F497D'><o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 style='border-collapse:collapse'><tr><td valign=top style='padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal style='line-height:115%'><i><u><span style='font-family:"Cambria","serif";color:#1F497D'>dx<sup>2</sup></span></u></i><i><u><sup><span style='font-size:12.0pt;line-height:115%;font-family:"Cambria","serif";color:#1F497D'><o:p></o:p></span></sup></u></i></p></td><td rowspan=2 style='padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal style='line-height:115%'><i><span style='font-family:"Cambria","serif";color:#1F497D'>=1</span></i><i><span style='font-family:"Cambria Math","serif";color:#1F497D'>⊗ </span></i><i><span style='font-family:"Cambria","serif";color:#1F497D'>x+x</span></i><i><span style='font-family:"Cambria Math","serif";color:#1F497D'>⊗</span></i><i><span style='font-family:"Cambria","serif";color:#1F497D'>1</span></i><span style='font-size:12.0pt;line-height:115%;font-family:"Cambria","serif";color:#1F497D'><o:p></o:p></span></p></td></tr><tr><td valign=top style='padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal style='line-height:115%'><i><span style='font-family:"Cambria","serif";color:#1F497D'>dx</span></i><i><span style='font-size:12.0pt;line-height:115%;font-family:"Cambria","serif";color:#1F497D'><o:p></o:p></span></i></p></td></tr></table><p class=MsoNormal style='line-height:115%'><i><span style='font-family:"Cambria","serif";color:#1F497D'> d<sub> </sub>x<sup>2</sup> =(1</span></i><i><span style='font-family:"Cambria Math","serif";color:#1F497D'>⊗ </span></i><i><span style='font-family:"Cambria","serif";color:#1F497D'>x+x</span></i><i><span style='font-family:"Cambria Math","serif";color:#1F497D'>⊗</span></i><i><span style='font-family:"Cambria","serif";color:#1F497D'>1)</span></i><i><span style='color:#1F497D'> ◦dx</span></i><i><span style='font-family:"Cambria","serif";color:#1F497D'>=dx x+x dx</span></i><span style='font-size:12.0pt;line-height:115%;font-family:"Cambria","serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='line-height:115%'><span style='font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif";color:#1F497D'><o:p> </o:p></span></p></td></tr></table><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p></div></body></html>