"This collection of documents presents the Isabelle formalization of Higher-Order Abstract Syntax (HOAS) as a definitional layer on top of First-Order Abstract Syntax (FOAS). The formal scripts shown here are provided as a technical companion to the paper ""HOAS on top of FOAS"" to be presented at LICS 2010 (and to its more detailed technical report version). They work with Isabelle2009-1. The scripts are currently under (intensive!) development. To obtain the latest version of the theory, please contact the author at uuomul@yahoo.com."
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