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\title{A Solution to the {\sc PoplMark} Challenge in Isabelle/HOL}
\author{Stefan Berghofer}
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\begin{abstract}
We present a solution to the {\sc PoplMark} challenge designed by Aydemir et al.,
which has as a goal the formalization of the meta-theory of System \fsub{}.
The formalization is carried out in the theorem prover Isabelle/HOL using an
encoding based on de Bruijn indices. We start with a relatively simple formalization
covering only the basic features of System \fsub{}, and explain how it can be extended
to also cover records and more advanced binding constructs.
\end{abstract}

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