We show that there are connections between principal type schemata, cut-free λ-nets, and normal forms of the λ-calculus, and hence there are correspondences between the normalisation algorithms of the above structures, i.e. unification of principal types, cut-elimination of λ-nets, and normalisation of λ-terms. Once the above correspondences have been established, properties of the typing system, such as typability, subject reduction, and inhabitation, can be derived from properties of λ-nets, and vice-versa. We illustrate the above pattern on a specific type assignment system, we study principal types for this system, and we show that they correspond to λ-nets with a non-standard notion of cut-elimination. Properties of the type system are then derived from results on λ-nets.
@InProceedings{digianantonio_et_al:LIPIcs.TYPES.2021.5, author = {Di Gianantonio, Pietro and Lenisa, Marina}, title = {{Principal Types as Lambda Nets}}, booktitle = {27th International Conference on Types for Proofs and Programs (TYPES 2021)}, pages = {5:1--5:23}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-254-9}, ISSN = {1868-8969}, year = {2022}, volume = {239}, editor = {Basold, Henning and Cockx, Jesper and Ghilezan, Silvia}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TYPES.2021.5}, URN = {urn:nbn:de:0030-drops-167744}, doi = {10.4230/LIPIcs.TYPES.2021.5}, annote = {Keywords: Lambda calculus, Principal types, Linear logic, Lambda nets, Normalization, Cut elimination} }
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