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\title{Renaming-Enriched Sets (Rensets) and Renaming-Based Recursion} \author{Andrei Popescu} \maketitle
\begin{abstract}
I formalize the notion of \emph{renaming-enriched sets} (\emph{rensets} sor short) and renaming-based recursion introduced in my \href{https://link.springer.com/book/10.1007/978-3-031-10769-6}{IJCAR 2022}
paper \href{https://link.springer.com/chapter/10.1007/978-3-031-10769-6_36}{``Rensets and Renaming-Based Recursion for Syntax with Bindings''} \cite{DBLP:conf/cade/Popescu22}.
Rensets are an algebraic axiomatization of renaming (variable-for-variable substitution).
The formalization includes a connection with nominal sets \cite{DBLP:conf/lics/GabbayP99,pitts_2013}, showing that any renset naturally gives rise to a nominal set.
It also includes examples of deploying the renaming-based recursor: semantic interpretation, counting functions for free and bound occurrences, unary and parallel substitution, etc. Finally, it includes a variation of rensets that axiomatize term-for-variable substitution, called \emph{substitutive sets}, which yields a corresponding recursion principle. \end{abstract}
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