With almost a century of historical distance between Heidegger’s retrieval of the question of being and contemporary concern about the Other, we have accrued invaluable experiences for critical leverage about what it is to ask one another questions. I offer a sketch aimed at adapting Tillich’s theological system grounded in existential questioning to today by juxtaposing him with Levinas’ philosophical ethics. Tillich and Levinas provide motive for reflection on the topic of questioning in particular. In the case of Tillich, questions (...) constitute a crucial moment in the dialogue between our contemporary existential situation and religious symbols, or in what he called the ‘method of correlation.’ Furthermore, Tillich locates in the very structure of questioning the germ of our participation in our essential nature despite existential disruption. Beneath his more provocative and prophetic discourse on the absolute desolation and height of the Other, Levinas sees in questions a different kind of possibility. It is not our essential and existential selves, but oneself and the absolutely Other who come together in the question yet retain their infinite difference. Heidegger is the immediate predecessor from whom both Tillich and Levinas inherit a predilection for reflection on questioning. What is at stake is not merely the legacy of Heidegger’s construal of questioning, but, more importantly here, the fundamental sources Tillich and Levinas posit as the origin of our questioning. (shrink)

How to say no less, no more about conditional than what is needed? From a logical analysis of necessary and sufficient conditions (Section 1), we argue that a stronger account of conditional can be obtained in two steps: firstly, by reminding its historical roots inside modal logic and set-theory (Section 2); secondly, by revising the meaning of logical values, thereby getting rid of the paradoxes of material implication whilst showing the bivalent roots of conditional as a speech-act based on affirmations (...) and rejections (Section 3). Finally, the two main inference rules for conditional, viz. Modus Ponens and Modus Tollens, are reassessed through a broader definition of logical consequence that encompasses both a normal relation of truth propagation and a weaker relation of falsity non-propagation from premises to conclusion (Section 3). (shrink)

The Interrogative Model of Inquiry and Dynamic Epistemic Logics are two central paradigms in formal epistemology. This paper is motivated by the observation of a significant complementarity between them: on the one hand, the IMI provides a framework for investigating inquiry represented as an idealized game between an Inquirer and Nature, along with an account of the interaction between questions and inferences in information-seeking processes, but is lacking a formulation in the multi-agent case; on the other hand, DELs model various (...) operations of information change in multi-agent systems, but the field is lacking a proper integration of question and inference dynamics, along with an application to the investigation of inquiry processes. The goal of this paper is to integrate the two paradigms in such a way as to combine their respective insights. To this end, we develop a formal system called DEL $$_\mathrm{IMI }$$ IMI which aims to represent the interaction between question and inference dynamics in inquiry—as described by the IMI—in a multi-agent setting, and this in such a way as to enable an investigation of inquiry games with multi-agent dimensions. The DEL $$_\mathrm{IMI }$$ IMI system is designed to represent the possible moves of such inquiry games through three types of epistemic actions: agents addressing questions to Nature, agents addressing questions to other agents, agents drawing logical inferences. We then show how the resulting framework can be used to formally define multi-agent inquiry games. We conclude by evaluating the interest of the DEL $$_\mathrm{IMI }$$ IMI system for the IMI and DELs paradigms. (shrink)