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\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{lpform}[2015/04/18]
\usepackage{xifthen}
\makeatletter
\newcounter{subcounter} % This is the counter for the sub-equations
\newcounter{eqcounter} % This counts the number of equations in the lpformulation environment
% Creating custom labels
\newcommand{\customlabel}[2]{\protected@write \@auxout{}{\string \newlabel {#1}{{#2}{}}}}
% The name of the formulation
\newcommand{\lpname}{}
% The lpformulation environment
\newenvironment{lpformulation}[1][]{\setcounter{eqcounter}{0}\renewcommand{\lpname}{#1} \start@align\tw@\st@rredfalse\m@ne \ifthenelse{\isempty{#1}}{}{\lpname}}{\endalign}
% The method that is used to display the for all arguments
\newcommand{\lpforall}[1]{\quad \forall #1}
% The size of the left indent
\newcommand{\lpindent}{\hspace{20pt}}
% The method that is used to tag subequations
\newcommand{\lpsubeqtag}{\theequation\alph{subcounter}}
% The text that is shown on the 'subject to' line
\newcommand{\lpsubjectto}{s.t.}
% Labeling the lp formulation
\newcommand{\lplabel}[1]{\customlabel{#1}{\lpname}}
% Splitting one equation into two lines
\newcommand{\lpnewline}{\nonumber\\&\lpindent}
% \lpobj(*)[label]{min/max}{objective function}
\def\lpobj{\@ifstar\@@lpobj\@lpobj}
\newcommand{\@lpobj}[3][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent\textrm{#2 } #3 \ifthenelse{\isempty{#1}}{}{\label{#1}}&\\&\lpindent\nonumber\textrm{\lpsubjectto}&}
\newcommand{\@@lpobj}[3][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent\textrm{#2 } #3 \nonumber \ifthenelse{\isempty{#1}}{}{\label{#1}}&\\&\lpindent\nonumber\textrm{\lpsubjectto}&}
% \lpeq(*)[label]{constraint}{for all}
\def\lpeq{\@ifstar\@@lpeq\@lpeq}
\newcommand{\@lpeq}[3][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent #2 \ifthenelse{\isempty{#3}}{}{\lpforall{#3}}\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
\newcommand{\@@lpeq}[3][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent #2 \nonumber\ifthenelse{\isempty{#3}}{}{\lpforall{#3}}\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
% \lpnewsubeq(*)[label]{constraint}{for all}
\def\lpnewsubeq{\@ifstar\@@lpnewsubeq\@lpnewsubeq}
\newcommand{\@lpnewsubeq}[3][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent\refstepcounter{equation}\setcounter{subcounter}{1} #2 \ifthenelse{\isempty{#3}}{}{\lpforall{#3}}\tag{\lpsubeqtag}\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
\newcommand{\@@lpnewsubeq}[3][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent\refstepcounter{equation}\setcounter{subcounter}{0} #2 \nonumber\ifthenelse{\isempty{#3}}{}{\lpforall{#3}}\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
% \lpsubeq(*)[label]{constraint}{for all}
\def\lpsubeq{\@ifstar\@@lpsubeq\@lpsubeq}
\newcommand{\@lpsubeq}[3][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent\refstepcounter{subcounter} #2 \ifthenelse{\isempty{#3}}{}{\lpforall{#3}}\tag{\lpsubeqtag}\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
\newcommand{\@@lpsubeq}[3][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent #2 \nonumber\ifthenelse{\isempty{#3}}{}{\lpforall{#3}}\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
% Using the noforall option
\DeclareOption{noforall}{
\renewcommand{\@lpeq}[2][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent #2 \ifthenelse{\isempty{#1}}{}{\label{#1}}&}
\renewcommand{\@@lpeq}[2][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent #2 \nonumber\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
\renewcommand{\@lpnewsubeq}[2][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent\refstepcounter{equation}\setcounter{subcounter}{1} #2 \tag{\lpsubeqtag}\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
\renewcommand{\@@lpnewsubeq}[2][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent\refstepcounter{equation}\setcounter{subcounter}{0} #2 \nonumber\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
\renewcommand{\@lpsubeq}[2][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent\refstepcounter{subcounter} #2 \tag{\lpsubeqtag}\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
\renewcommand{\@@lpsubeq}[2][]{\ifthenelse{\value{eqcounter} = 0}{}{\displaybreak[0]\\}\stepcounter{eqcounter}&\lpindent #2 \nonumber\ifthenelse{\isempty{#1}}{}{\label{#1}}&}
}
% Using the alignedforall option
\DeclareOption{alignedforall}{
\renewcommand{\lpforall}[1]{&& \forall #1}
}
\ExecuteOptions{}
\ProcessOptions\relax
\makeatother
\endinput
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