\documentclass[11pt,notitlepage]{article}
\usepackage{graphicx, datetime, multicol, qrcode,
  stmaryrd, % for \sslash
  mathbbol % for \bbe.
}
\usepackage[margin=0.25in,foot=0.2in]{geometry}
% Following http://tex.stackexchange.com/a/847/22475:
\usepackage[setpagesize=false]{hyperref}\hypersetup{colorlinks,
  linkcolor={blue!50!black},
  citecolor={blue!50!black},
  urlcolor=blue
}

\def\sheeturl{{\url{http://drorbn.net/AcademicPensieve/Projects/FullDoPeGDO/}}}
\def\myurl{http://www.math.toronto.edu/~drorbn}

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\def\calA{{\mathcal A}}
\def\calR{{\mathcal R}}
\def\calT{{\mathcal T}}
\def\calV{{\mathcal V}}
\def\calX{{\mathcal X}}
\def\calY{{\mathcal Y}}

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\def\arXiv#1{{\href{http://arxiv.org/abs/#1}{{\tiny arXiv:}\linebreak[0]{\small #1}}}}
\def\Hom{\operatorname{Hom}}
\def\qed{{\linebreak[1]\null\hfill\text{$\Box$}}}
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\def\nbpdfEcho#1{\vskip 1mm\par\noindent\includegraphics{#1}}
\def\nbpdfOutput#1{\vskip 1mm\par\noindent\includegraphics{#1}}
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\def\nbpdfgraphOutput#1{\vskip 1mm\par\noindent\includegraphics[width=1.5in]{#1}}

\begin{document}
\parindent 0in

\parbox[b]{4.3in}{
  {\LARGE\bf Dror Bar-Natan: FullDoPeGDO}
  }
\hfill\parbox[b]{3.4in}{\tiny
  \null\hfill\sheeturl
  \newline\null\hfill initiated June 14, 2021; modified \today, \ampmtime
}~%
\raisebox{0.2em}{
  \qrcode[height=1.2em,level=L,nolink]{drorbn.net/ap/Projects/FullDoPeGDO}
}

\vskip -3mm
\rule{\textwidth}{1pt}
\vspace{-8mm}

\begin{multicols*}{2}

\input Engine.tex
\input Objects.tex
\input KT.tex

\end{multicols*}
\end{document}