Christophe Geudens is a Junior Research Fellow at the FWO/Research Foundation Flanders and KU Leuven, specializing in the history of modal logic and logical geometry. He holds a Masters in linguistics and a PhD in the history of logic (both from KU Leuven), and he is an Honorary Fellow of the Belgian American Educational Foundation (BAEF). He has published in venues such as Argumentation, History and Philosophy of Logic, Vivarium, and Historiographia Linguistica.

Lorenz Demey is a Research Professor at KU Leuven, specializing in logical geometry and the history of modal logic. He studied philosophy, mathematics, logic and artificial intelligence in Leuven and Amsterdam. In 2020 he received the Frans Van Cauwelaert Prize from the Royal Flemish Academy of Belgium (KVAB). He has published in venues such as Journal of Philosophical Logic, Synthese, and History and Philosophy of Logic. 

Chapter 1. Introduction.- Chapter 2. The Foundations of Fabri's Modal Logic.- Chapter 3. Fabri's Logic of Composite Modals.- Chapter 4. Model-theoretic Reconstruction of Fabri's Logic of Composite Modals.- Chapter 5. Fabri's Logic of Composite Modals in its Historical Context.- Chapter 6. Fabri's Logic of Divided Modals.- Chapter 7. Fabri's Logic of Divided Modals in its Historical Context.- Chapter 8. Conclusion.- Appendix I: Transcription of Fabri's Questions on De int. 12-13.- Appendix II: Formal Proofs.- Index.