It is known that the quantale of sup-preserving maps from a complete lattice to itself is a Frobenius quantale if and only if the lattice is completely distributive. Since completely distributive lattices are the nuclear objects in the autonomous category of complete lattices and sup-preserving maps, we study the above statement in a categorical setting. We introduce the notion of Frobenius structure in an arbitrary autonomous category, generalizing that of Frobenius quantale. We prove that the monoid of endomorphisms of a nuclear object has a Frobenius structure. If the environment category is star-autonomous and has epi-mono factorizations, a variant of this theorem allows to develop an abstract phase semantics and to generalise the previous statement. Conversely, we argue that, in a star-autonomous category where the monoidal unit is a dualizing object, if the monoid of endomorphisms of an object has a Frobenius structure and the monoidal unit embeds into this object as a retract, then the object is nuclear.
@InProceedings{delacroix_et_al:LIPIcs.CSL.2023.18, author = {de Lacroix, C\'{e}dric and Santocanale, Luigi}, title = {{Frobenius Structures in Star-Autonomous Categories}}, booktitle = {31st EACSL Annual Conference on Computer Science Logic (CSL 2023)}, pages = {18:1--18:20}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-264-8}, ISSN = {1868-8969}, year = {2023}, volume = {252}, editor = {Klin, Bartek and Pimentel, Elaine}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2023.18}, URN = {urn:nbn:de:0030-drops-174798}, doi = {10.4230/LIPIcs.CSL.2023.18}, annote = {Keywords: Quantale, Frobenius quantale, Girard quantale, associative algebra, star-autonomous category, nuclear object, adjoint} }
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