## Computing overlappings by unification in the deterministic lambda calculus LR with letrec, case, constructors, seq and variable chains

Correctness of program transformations in extended lambda calculi with a contextual semantics is usually based on reasoning about the operational semantics which is a rewrite semantics. A successful approach to proving c

Correctness of program transformations in extended lambda calculi with a contextual semantics is usually based on reasoning about the operational semantics which is a rewrite semantics. A successful approach to proving correctness is the combination of a context lemma with the computation of overlaps between program transformations and the reduction rules.The method is similar to the computation of critical pairs for the completion of term rewriting systems. We describe an effective unification algorithm to determine all overlaps of transformations with reduction rules for the lambda calculus LR which comprises a recursive let-expressions, constructor applications, case expressions and a seq construct for strict evaluation. The unification algorithm employs many-sorted terms, the equational theory of left-commutativity modeling multi-sets, context variables of different kinds and a mechanism for compactly representing binding chains in recursive let-expressions. As a result the algorithm computes a finite set of overlappings for the reduction rules of the calculus LR that serve as a starting point to the automatization of the analysis of program transformations.…

Author: | Conrad Rau, Manfred Schmidt-Schauß |
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URN: | urn:nbn:de:hebis:30-115479 |

URL: | http://www.ki.informatik.uni-frankfurt.de/papers/frank/frank-46.pdf |

Parent Title (English): | Technical report Frank / Johann-Wolfgang-Goethe-Universität, Fachbereich Informatik und Mathematik, Institut für Informatik ; 46 |

Series (Serial Number): | Technical report Frank / Johann-Wolfgang-Goethe-Universität, Fachbereich Informatik und Mathematik, Institut für Informatik (46) |

Publisher: | Johann Wolfgang Goethe-Univ., Fachbereich Informatik und Mathematik, Inst. für Informatik, Research group for Artificial Intelligence and Software Technology |

Place of publication: | Frankfurt [am Main] |

Document Type: | Working Paper |

Language: | English |

Year of Completion: | 2011 |

Year of first Publication: | 2011 |

Publishing Institution: | Univ.-Bibliothek Frankfurt am Main |

Release Date: | 2011/09/15 |

Pagenumber: | 52 |

First Page: | 1 |

Last Page: | 52 |

HeBIS PPN: | 277094275 |

Institutes: | Informatik |

Dewey Decimal Classification: | 004 Datenverarbeitung; Informatik |

Sammlungen: | Universitätspublikationen |

Licence (German): | Veröffentlichungsvertrag für Publikationen |