Implicit automata in {\lambda}-calculi III: affine planar string-to-string functions
We prove a characterization of first-order string-to-string transduction via $\lambda$-terms typed in non-commutative affine logic that compute with Church encoding, extending the analogous known characterization of star-free languages. We show that every first-order transduction can be computed by...
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| Vydáno v: | Electronic Notes in Theoretical Informatics and Computer Science Ročník 4 - Proceedings of... |
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| Hlavní autoři: | , |
| Médium: | Journal Article |
| Jazyk: | angličtina |
| Vydáno: |
11.12.2024
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| ISSN: | 2969-2431, 2969-2431 |
| On-line přístup: | Získat plný text |
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| Shrnutí: | We prove a characterization of first-order string-to-string transduction via $\lambda$-terms typed in non-commutative affine logic that compute with Church encoding, extending the analogous known characterization of star-free languages. We show that every first-order transduction can be computed by a $\lambda$-term using a known Krohn-Rhodes-style decomposition lemma. The converse direction is given by compiling $\lambda$-terms into two-way reversible planar transducers. The soundness of this translation involves showing that the transition functions of those transducers live in a monoidal closed category of diagrams in which we can interpret purely affine $\lambda$-terms. One challenge is that the unit of the tensor of the category in question is not a terminal object. As a result, our interpretation does not identify $\beta$-equivalent terms, but it does turn $\beta$-reductions into inequalities in a poset-enrichment of the category of diagrams.
Comment: 19+1 pages, 7 figures; camera-ready version for MFPS |
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| ISSN: | 2969-2431 2969-2431 |
| DOI: | 10.46298/entics.14804 |