\documentclass[a4paper,12pt,fleqn]{scrartcl}

%%------------------------------------------------------------------------------
% Various
%%------------------------------------------------------------------------------
%\usepackage{fixltx2e}                  % Various fixes.
%\usepackage{xltxtra}                   % Not really necessary unless you need to use the \XeLaTeX{}.
%\usepackage{etoolbox}                  % Defines \newrobustcmd{} and other goodies.
%\usepackage{xspace}                    % Read the documentation, you may need it when you define new commands
%\usepackage{import}                    % sane imports. Much better than \input{} command.

%%------------------------------------------------------------------------------
% Geometry - Layout
%%------------------------------------------------------------------------------
%\usepackage[a4paper,xetex]{geometry}   % Customize page layout
%\usepackage{multicol}                  % Use multiple columns
%\usepacakge{pdflscape}                 % Pages in landscape mode
%\usepackage{parskip}                   % Use it when you want your paragraphs
                                        % to be separated by an extra space.


%%------------------------------------------------------------------------------
% Graphics - Colors
%%------------------------------------------------------------------------------
%\usepackage{graphicx}                  % including figures
%\usepackage{xcolor}                    % More options with colors

%%------------------------------------------------------------------------------
% Languages
%%------------------------------------------------------------------------------
%% Greek language hyphenation rules
%\usepackage{xgreek}
%% Change hyphenation rules automatically when switching from greek to english glyphs.
%\usepackage[Greek,Latin]{ucharclasses}
%\setTransitionsForGreek{\setlanguage{greek}}{\setlanguage{english}}

%%------------------------------------------------------------------------------
% Fonts
%%------------------------------------------------------------------------------
%\usepackage{fontspec}
%\setmainfont[%
    %Kerning=On,
    %Mapping=tex-text,
    %UprightFont = Minion Pro,
    %ItalicFont = Minion Pro Italic,
    %SlantedFont = Minion Pro Italic,
    %BoldFont = Minion Pro Semibold,
    %BoldItalicFont = Minion Pro Semibold Italic,
    %BoldSlantedFont = Minion Pro Semibold Italic,
    %SmallCapsFont = Minion Pro,
        %]{Minion Pro}
%\setsansfont[%
    %Kerning=On,
    %Mapping=tex-text,
    %UprightFont = Myriad Pro,
    %ItalicFont = Myriad Pro Italic,
    %SlantedFont = Myriad Pro Italic,
    %BoldFont = Myriad Pro Semibold,
    %BoldItalicFont = Myriad Pro Semibold Italic,
    %BoldSlantedFont = Myriad Pro Semibold Italic,
    %SmallCapsFont = Myriad Pro,
        %]{Myriad Pro}
%\setmonofont[%
    %Kerning=On,
    %Mapping=tex-text,
        %]{Consolas}
%\usepackage{microtype}         % advanced kerning rules
                                % Note: doesn't work fully with XeLaTeX

%%------------------------------------------------------------------------------
% Math
%%------------------------------------------------------------------------------
%\usepackage{amsmath}
%\usepackage[math-style=ISO]{unicode-math}
%\usepackage{mathtools}
%\newtagform{brackets}{[}{]}
%\usetagform{brackets}
%% Math fonts
%\setmathfont{XITS Math}
%\setmathfont[range=\ell]{Latin Modern Math}
%% custom math commands
%\newcommand{\abs}[1]{\ensuremath{\left|#1\right|}}
%\newcommand{\paren}[1]{\ensuremath{\left(#1\right)}}
%\newcommand{\brac}[1]{\ensuremath{\left[#1\right]}}
%\newcommand{\Brac}[1]{\ensuremath{\left\{#1\right\}}}

%%------------------------------------------------------------------------------
% Tables
%%------------------------------------------------------------------------------
%\usepackage{longtable}
%\usepackage{booktabs}
%\usepackage{multirow}
%\usepackage{tabu}
%\usepackage{colortbl}
%\usepackage{siunitx}
%\sisetup{table-align-text-post = false,table-format = +1.2}

% threepartable allows to insert notes into a table.
% threepartablex extends threeparttable to work with longtable.
% They are not compatible with tabu!
%\usepackage{threeparttable}
%\usepackage[referable]{threeparttablex}

% Patching the threeparttable package in order to work fine with tabu.
% The patch must be applied before loading the caption package.
% Look here : http://tex.stackexchange.com/questions/56504/threeparttablex-table-notes-for-tabu-tabulars-with-less-than-textwidth
%\usepackage{xpatch}
%\makeatletter
%\chardef\TPT@@@asteriskcatcode=\catcode`*
%\catcode`*=11
%\xpatchcmd{\threeparttable}
%  {\TPT@hookin{tabular}}
%  {\TPT@hookin{tabular}\TPT@hookin{tabu}}
%  {}{}
%\catcode`*=\TPT@@@asteriskcatcode
%\makeatother

%% custom commands
%\newcommand{\mc}[1]{\multicolumn{1}{c}{#1}}
%\newcommand{\mr}[1]{\multirow{2}{*}{#1}}

%%------------------------------------------------------------------------------
% Lists
%%------------------------------------------------------------------------------
% Defines new compact version of enumerate, itemize and description environments.
% They are called respectively compactenum, compactitem, compactdesc
%\usepackage{paralist}                  % Adds flexibility to the spacing of the standard environments:
%%------------------------------------------------------------------------------
% You can finetune the spacing of the new environments by changing the following lengths
%\setlength{\pltopsep}{0pt}      % Space between first item and preceding paragraph.
%\setlength{\plpartopsep}{0pt}   % Extra space added to \topsep when environment starts a new paragraph (is called in vmode).
%\setlength{\plitemsep}{0pt}     % Space between successive items.
%\setlength{\plparsep}{0pt}      % Space between paragraphs within an item – the \parskip for this environment.

%%------------------------------------------------------------------------------
% Captions
%%------------------------------------------------------------------------------
%\usepackage[%
    %margin=10pt,
    %font={small},
    %labelfont=bf,
    %labelsep=endash]
    %{caption}
%\usepackage{subcaption}

%%------------------------------------------------------------------------------
% Hyperlinks
%%------------------------------------------------------------------------------
%\usepackage[final]{hyperref}
%\usepackage{url}
%\hypersetup{
    %bookmarks=true,                               % show bookmarks bar?
    %unicode=true,                                 % non-Latin characters in Acrobat’s bookmarks
    %pdftoolbar=true,                              % show Acrobat’s toolbar?
    %pdfmenubar=true,                              % show Acrobat’s menu?
    %pdffitwindow=false,                           % window fit to page when opened
    %pdfstartview={FitH},                          % fits the width of the page to the window
    %pdftitle={title},                             % title
    %pdfauthor={FirstName SecondName},             % author
    %pdfsubject={Subject},                         % subject of the document
    %pdfcreator={FirstName SecondName},            % creator of the document
    %pdfproducer=FirstName SecondName},            % producer of the document
    %pdfkeywords={keyword1} {key2} {key3},         % list of keywords
    %pdfnewwindow=true,                            % links in new window
    %colorlinks=true,                              % false: boxed links; true: colored links
    %linkcolor=red,                                % color of internal links
    %anchorcolor=blue,                             % color of anchors
    %citecolor=green,                              % color of links to bibliography
    %filecolor=magenta,                            % color of file links
    %urlcolor=cyan,                                % color of external links
    %pdfpagelayout=SinglePage
%}

%%------------------------------------------------------------------------------
% Headers - Footers
%%------------------------------------------------------------------------------
%\usepackage{fancyhdr}
%\fancyhf{} % clear all header and footer fields

%%------------------------------------------------------------------------------
% Custom Commands
%%------------------------------------------------------------------------------
%\newrobustcmd*{\tsup}[1]{\textsuperscript{#1}}
%\newrobustcmd*{\tsub}[1]{\textsubscript{#1}}

\begin{document}

\end{document}