ILLC-LIRa

illc-lira@list.uva.nl

1 participants
582 discussions

LIRa session: Alexandru Baltag (tomorrow, Thursday, 12 October 16:30)
by LIRa Seminar 11 Oct '23

11 Oct '23

Dear all, We will have our next LIRa session tomorrow, on Thursday, 12 October 16:30. This will be a hybrid session. If you want to attend online, please use our recurring zoom link: https://uva-live.zoom.us/j/89230639823?pwd=YWJuSnJmTDhXcWhmd1ZkeG5zb0o5UT09 (Meeting ID: 892 3063 9823, Passcode: 421723) You can find the details of the talk below. Speaker: Alexandru Baltag (ILLC, University of Amsterdam) Date and Time: Thursday, October 12th 2023, 16:30-18:00 Venue: ILLC seminar room F1.15 in Science Park 107 and online Title: The Dynamic Logic of Causality: from counterfactual dependence to causal interventions Abstract. Pearl's causal models have become the standard/dominant approach to representing and reasoning about causality. The setting is based on the static notion of causal graphs, but it also makes an essential use of the dynamic notion of causal interventions. In particular, Halpern and Pearl used this setting to define and investigate various notions of actual causality. As noted by many, causal interventions have an obvious counterfactual flavour. But... their relationship with the counterfactual conditionals (a la Lewis-Stalnaker) has remained murky! A lot of confusion surrounds this topic. The purpose of this talk is threefold: 1. understand interventions as dynamic modalities (rather than conditionals); 2. elucidate the relationship between intervention modalities and counterfactual conditionals; 3. formalize and completely axiomatize a Causal Intervention Calculus (CIC), that is general enough to allow us to capture both interventions and causal conditionals, but also expressive enough to capture the various notions of actual causality proposed in the literature. Hope to see you there! The LIRa team

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LIRa session: Alexandru Baltag (Thursday, 12 October 16:30)
by LIRa Seminar 06 Oct '23

06 Oct '23

Dear all, We will have our next LIRa session on Thursday, 12 October 16:30. This will be a hybrid session. If you want to attend online, please use our recurring zoom link: https://uva-live.zoom.us/j/89230639823?pwd=YWJuSnJmTDhXcWhmd1ZkeG5zb0o5UT09 (Meeting ID: 892 3063 9823, Passcode: 421723) You can find the details of the talk below. Speaker: Alexandru Baltag (ILLC, University of Amsterdam) Date and Time: Thursday, October 12th 2023, 16:30-18:00 Venue: ILLC seminar room F1.15 in Science Park 107 and online Title: The Dynamic Logic of Causality: from counterfactual dependence to causal interventions Abstract. Pearl's causal models have become the standard/dominant approach to representing and reasoning about causality. The setting is based on the static notion of causal graphs, but it also makes an essential use of the dynamic notion of causal interventions. In particular, Halpern and Pearl used this setting to define and investigate various notions of actual causality. As noted by many, causal interventions have an obvious counterfactual flavour. But... their relationship with the counterfactual conditionals (a la Lewis-Stalnaker) has remained murky! A lot of confusion surrounds this topic. The purpose of this talk is threefold: 1. understand interventions as dynamic modalities (rather than conditionals); 2. elucidate the relationship between intervention modalities and counterfactual conditionals; 3. formalize and completely axiomatize a Causal Intervention Calculus (CIC), that is general enough to allow us to capture both interventions and causal conditionals, but also expressive enough to capture the various notions of actual causality proposed in the literature. Hope to see you there! The LIRa team

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LIRa session: Gillman Payette (tomorrow, Thursday, 28 September 17:00, ONLINE only)
by LIRa Seminar 27 Sep '23

27 Sep '23

Dear all, We will have our next LIRa session tomorrow, on Thursday, 28 September 17:00. This will be an ONLINE-only session. If you want to attend, please use our recurring zoom link: https://uva-live.zoom.us/j/89230639823?pwd=YWJuSnJmTDhXcWhmd1ZkeG5zb0o5UT09 (Meeting ID: 892 3063 9823, Passcode: 421723) You can find the details of the talk below. Speaker: Gillman Payette (Department of Philosophy, University of Calgary) Date and Time: Thursday, September 28th 2023, 17:00-18:30 (NOTE the unusual time) Venue: online only. (i.e. not hybrid!) Title: Connecting Schotch-Jennings forcing and Rescher-Manor inference Abstract. Inference from inconsistent data is a challenging problem. Some ways of dealing with it propose changing the concept of logical consequence; these are often referred to as paraconsistent logics. On the other hand, some suggest keeping the standard conception of (classical) logical consequence and dealing with the inconsistency by judicially arranging the data so as to avoid the problematic interactions between data that could make trouble. The latter is characteristic of the North American approaches to inference from inconsistency. In this talk, I will discuss two such versions of paraconsistent inference. The first, due to Rescher and Manor, derives conclusions based on what follows from maximally consistent subsets of the data. The other due to Schotch and Jennings, looks at what follows from at least one subset in every — minimally — partitioned reorganization of the data into consistent sets. After looking at the shortcomings of each, I will show how to combine them to get a system that, arguably, meets the requirements set by the various theorists, but makes fewer assumptions than the theorists' suggestions for deriving more from inconsistent data. Hope to see you there! The LIRa team

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Joint NihiL and LIRa session: Yanjing Wang and Zilu Wang (tomorrow, Tuesday, 26 September 14:00)
by LIRa Seminar 25 Sep '23

25 Sep '23

Dear all, We will have our next LIRa session tomorrow, on Tuesday, 26 September 14:00. You can find the details of the talk below. This will be a joint session together with the NihiL seminar. Speakers: Yanjing Wang and Zilu Wang (Peking University) Date and Time: Tuesday, September 26th 2023, 14:00-15:30 (NOTE the unusual day and time) Venue: hybrid! KdVI seminar room F3.20 in Science Park 107 and the zoom link of the NihiL seminar: https://uva-live.zoom.us/j/87618965843 Title: A Bundled Approach to Deontic Logic Abstract. In this talk, we will introduce a new semantic approach to deontic logic based on the so-called bundled modalities, which essentially pack a quantifier and a modality together. Our starting point is the observation that many "strange" logical behaviors of modalities and logical connectives in natural language are due to the fact that they have more complicated inner logical structures in the semantics. Many examples can be found in epistemic logics of know-wh, where the know-wh modalities often have the implicit ∃x structure based on the mention-some interpretation. As the logical puzzles are abundant in deontic logic, a natural question arises for us: are there also some bundles hidden in the deontic modalities? In fact, the possibilities of viewing permissions and obligations as bundles were informally discussed by Hintikka in the early days of deontic logic. For example, Hintikka proposed to understand permission as a bundle of ∀x◇, i.e., an action type α is permitted iff every token of α is executable on some deontically ideal world. Given the techniques of the bundled modalities, we can flesh out this proposal formally, which results in a desirable logic of free-choice permission satisfying most of the intuitive properties. Moreover, this semantics also predicts new logical behaviors not yet discussed in the literature. For example, according to our semantics, one of the four distributive laws of conjunction and disjunction is invalid, which aligns with our linguistic intuition. Besides the bundled modalities, our approach also features the Brouwer-Heyting-Kolmogorov (BHK) style treatment of propositions as action types inspired by intuitionistic logic. This opens the possibility of fine-grained control of the composition of action types in terms of non-classical connectives. It also reveals the subtleties behind the negation, conjunction, and implication in deontic logic. We will end with a discussion on higher-order permissions that can be treated in our approach by allowing nested permission modalities in the language. Hope to see you there! The LIRa team

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Two events next week: Joint NihiL and LIRa session with Yanjing Wang and Zilu Wang (Tuesday, 26 September 14:00) // LIRa session: Gillman Payette (Thursday, 28 September 17:00)
by LIRa Seminar 19 Sep '23

19 Sep '23

Dear all, We will have two events next week! - a joint Joint NihiL and LIRa session on Tuesday, 26 September 14:00. - an online-only LIRa session on Thursday, 28 September at 17:00. You can find the details of both talks below. *joint session together with the NihiL seminar* Speakers: Yanjing Wang and Zilu Wang (Peking University) Date and Time: Tuesday, September 26th 2023, 14:00-15:30 (NOTE the unusual day and time) Venue: hybrid! KdVI seminar room F3.20 in Science Park 107 and the zoom link of the NihiL seminar: https://uva-live.zoom.us/j/87618965843 Title: A Bundled Approach to Deontic Logic Abstract. In this talk, we will introduce a new semantic approach to deontic logic based on the so-called bundled modalities, which essentially pack a quantifier and a modality together. Our starting point is the observation that many "strange" logical behaviors of modalities and logical connectives in natural language are due to the fact that they have more complicated inner logical structures in the semantics. Many examples can be found in epistemic logics of know-wh, where the know-wh modalities often have the implicit ∃x structure based on the mention-some interpretation. As the logical puzzles are abundant in deontic logic, a natural question arises for us: are there also some bundles hidden in the deontic modalities? In fact, the possibilities of viewing permissions and obligations as bundles were informally discussed by Hintikka in the early days of deontic logic. For example, Hintikka proposed to understand permission as a bundle of ∀x◇, i.e., an action type α is permitted iff every token of α is executable on some deontically ideal world. Given the techniques of the bundled modalities, we can flesh out this proposal formally, which results in a desirable logic of free-choice permission satisfying most of the intuitive properties. Moreover, this semantics also predicts new logical behaviors not yet discussed in the literature. For example, according to our semantics, one of the four distributive laws of conjunction and disjunction is invalid, which aligns with our linguistic intuition. Besides the bundled modalities, our approach also features the Brouwer-Heyting-Kolmogorov (BHK) style treatment of propositions as action types inspired by intuitionistic logic. This opens the possibility of fine-grained control of the composition of action types in terms of non-classical connectives. It also reveals the subtleties behind the negation, conjunction, and implication in deontic logic. We will end with a discussion on higher-order permissions that can be treated in our approach by allowing nested permission modalities in the language. *Online LIRa session with Gillman Payette* Speaker: Gillman Payette (Department of Philosophy, University of Calgary) Date and Time: Thursday, September 28th 2023, 17:00-18:30 (NOTE the unusual time) Venue: online only. (i.e. not hybrid!) Please use our recurring zoom link: https://uva-live.zoom.us/j/89230639823?pwd=YWJuSnJmTDhXcWhmd1ZkeG5zb0o5UT09 (Meeting ID: 892 3063 9823, Passcode: 421723) Title: Connecting Schotch-Jennings forcing and Rescher-Manor inference Abstract. Inference from inconsistent data is a challenging problem. Some ways of dealing with it propose changing the concept of logical consequence; these are often referred to as paraconsistent logics. On the other hand, some suggest keeping the standard conception of (classical) logical consequence and dealing with the inconsistency by judicially arranging the data so as to avoid the problematic interactions between data that could make trouble. The latter is characteristic of the North American approaches to inference from inconsistency. In this talk, I will discuss two such versions of paraconsistent inference. The first, due to Rescher and Manor, derives conclusions based on what follows from maximally consistent subsets of the data. The other due to Schotch and Jennings, looks at what follows from at least one subset in every — minimally — partitioned reorganization of the data into consistent sets. After looking at the shortcomings of each, I will show how to combine them to get a system that, arguably, meets the requirements set by the various theorists, but makes fewer assumptions than the theorists’ suggestions for deriving more from inconsistent data. Hope to see you there! The LIRa team

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LIRa session: Avijeet Ghosh (tomorrow, Thursday, 14 September 16:30)
by LIRa Seminar 13 Sep '23

13 Sep '23

Dear all, We will have our next LIRa session tomorrow, on Thursday, 14 September 16:30. This will be a hybrid session. If you want to attend online, please use our recurring zoom link: https://uva-live.zoom.us/j/89230639823?pwd=YWJuSnJmTDhXcWhmd1ZkeG5zb0o5UT09 (Meeting ID: 892 3063 9823, Passcode: 421723) You can find the details of the talk below. Speaker: Avijeet Ghosh Date and Time: Thursday, September 14th 2023, 16:30-18:00 Venue: ILLC seminar room F1.15 in Science Park 107 and online Title: Complexity Study of Reasoning about Knowledge and Public Observations Abstract. This talk explores the model checking and satisfiability problems in logical systems for reasoning about knowledge and observations of intelligent agents and their interactions. We examine the foundations laid by Kripke and Hintikka, which paved the way towards the development of their dynamic counterparts, e.g., Public announcement logic, and its extensions like Dynamic epistemic logic and Public observation logic. Complexity studies for these logics stem from similar studies in temporal logics initiated by Halpern and Vardi, among others. More specifically, we focus on Public observation logic and analyze its model checking and satisfiability problems. By investigating these problems, we uncover insights into effective and efficient reasoning about knowledge in multi-agent scenarios. Moreover, we explore how these insights can be applied in solving standard problems in relevant domains like planning. Hope to see you there! The LIRa team

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JRC Joint PhD Celebration Event on Tuesday 12 September // LIRa session with Avijeet Ghosh on Thursday 14 September
by LIRa Seminar 08 Sep '23

08 Sep '23

Dear all, Next week we will have two events: 1) Tuesday 12 September: *JRC Celebration Event* On 12 September 2023, the joint research center for Logic at both Tsinghua University and the University of Amsterdam (UvA) will organize a small workshop to celebrate the completion of three new joint PhD theses. The work reported on in these new PhD thesis projects is perfectly aligned with the main mission of the JRC centre to further broaden the interdisciplinary view of logic. We will take the opportunity in the afternoon of 12 September to celebrate these new achievements and warmly invite all interested researchers and students to attend the event. The celebration event will take place at the ILLC, University of Amsterdam, Science Park on Tuesday, the 12th of September 2023, in hybrid format. See http://tsinghualogic.net/JRC/joint-phd-celebration 2) Thursday 14 September: *LIRa session with Avijeet Ghosh* Speaker: Avijeet Ghosh Date and Time: Thursday, September 14th 2023, 16:30-18:00 Venue: ILLC seminar room F1.15 in Science Park 107 and online Title: Complexity Study of Reasoning about Knowledge and Public Observations Abstract. This talk explores the model checking and satisfiability problems in logical systems for reasoning about knowledge and observations of intelligent agents and their interactions. We examine the foundations laid by Kripke and Hintikka, which paved the way towards the development of their dynamic counterparts, e.g., Public announcement logic, and its extensions like Dynamic epistemic logic and Public observation logic. Complexity studies for these logics stem from similar studies in temporal logics initiated by Halpern and Vardi, among others. More specifically, we focus on Public observation logic and analyze its model checking and satisfiability problems. By investigating these problems, we uncover insights into effective and efficient reasoning about knowledge in multi-agent scenarios. Moreover, we explore how these insights can be applied in solving standard problems in relevant domains like planning. This will be a hybrid session. If you want to attend online, please use our recurring zoom link: https://uva-live.zoom.us/j/89230639823?pwd=YWJuSnJmTDhXcWhmd1ZkeG5zb0o5UT09 (Meeting ID: 892 3063 9823, Passcode: 421723) Hope to see you there! The LIRa team

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LIRa-related Call for Papers: Logics of Communicative Interaction - Special Issue of RAP - Extended Deadline 31st October 2023
by LIRa Seminar 08 Sep '23

08 Sep '23

Dear subscribers of the LIRa seminar, We would like to draw your attention to a LIRa-related Call for Papers, see below. kind regards, The LIRa team 3rd Call for Papers (Deadline Extended) ************************************************************ Special Issue of RAP (Review of Analytic Philosophy) on Logics of Communicative Interaction ************************************************************ We invite submissions to a Special Issue on `Logics of Communicative Interaction'. This special issue will appear in the peer-reviewed international journal called the `Review of Analytic Philosophy', which was first launched in 2021 as a new Open Access journal in analytic philosophy. This special issue welcomes new work on the logical study of dynamic changes that take place in scenarios of communicative interaction. Complex forms of change in cognitive states of agents and their social relations can occur in the process of communicative interaction, which calls for a detailed logical analysis. A central topic in such an analysis is the triggers of such changes and their effects during the process of communication. The triggers can include a variety of possible speech acts while an analysis of their effect will typically zoom-in on the formal representations of agent's doxastic and epistemic attitudes as well as the deontic status of action types available to them. The study of such logics for communicative interaction can be approached from different disciplines, including logic, epistemology, argumentation theory, social choice theory, AI, Computer Science, and Philosophy. More specifically, this special issue welcomes work on the following topics: - Dynamic Logics of Communication - Logics of Speech Acts - Logics for Belief Change and Knowledge Updates - Dynamic Epistemic Logics - Logical analysis of Communication in Social Networks - Dynamic Deontic Logic All papers will be peer reviewed according to the standards of the Journal. Authors are advised to read the CFP of the journal downloadable from the following page: https://rap-journal.net/call-for-papers/ . All the conditions specified in the CFP of the journal apply except the condition on the publication fee: papers accepted for publication in this special issue will be published free of charge. Submission details: Manuscripts should be between 8000 and 10000 words and submitted as a double-spaced Word document or PDF file with an abstract of around 150 words. They should be fully anonymized to ensure double-blind reviewing. Manuscripts are submitted under the understanding that they have not been published elsewhere, either in whole or in part, and are not currently under review elsewhere. Submissions can be made via the online submission form at https://rap-journal.net/submit-for-authors/ or by email attachments (rap(a)myukk.org). If the authors intend to use LaTeX for preparing the manuscript, please use the standard article class and submit the manuscript in the form of a PDF file (neither the source files nor the dvi file). Submission Deadline: 31st October 2023 (Extended) All inquiries should be sent to rap(a)myukk.org . Guest co-editors of the special issue: Sonja Smets Tomoyuki Yamada

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LIRa session: Daniil Khaitovich (tomorrow, Thursday, 7 September 16:30)
by LIRa Seminar 06 Sep '23

06 Sep '23

Dear all, We will have our next LIRa session tomorrow, on Thursday, 7 September 16:30. This will be a hybrid session. If you want to attend online, please use our recurring zoom link: https://uva-live.zoom.us/j/89230639823?pwd=YWJuSnJmTDhXcWhmd1ZkeG5zb0o5UT09 (Meeting ID: 892 3063 9823, Passcode: 421723) You can find the details of the talk below. Speaker: Daniil Khaitovich (ILLC) Date and Time: Thursday, September 7th 2023, 16:30-18:00 Venue: ILLC seminar room F1.15 in Science Park 107 and online Title: Fixing group STIT logic Abstract. STIT is a modal logic of agency to formalize statements of the form "agent i sees to it that φ". One of its extensions, group STIT, allows to reason not only about individual agents, but about coalitions as well. The main advantage of that extension is its expressivity: it was shown that it is strictly more expressive than other popular multi-agent modal logics with coalitions such as Coalition logic or Alternating-time temporal logic. Nevertheless, it does not come for free: group STIT is neither decidable nor finitely axiomatizable. During the talk, we will identify one conceptual problem with group STIT — the way groups and their actions are treated — and show the weaker version of logic to escape it, providing it with finite axiom system and proving its decidability as well. A number of connections with logic of dependence and relativized cylindric algebras will be shown as well. Hope to see you there! The LIRa team

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LIRa session: Daniil Khaitovich (Thursday, 7 September 16:30)
by LIRa Seminar 01 Sep '23

01 Sep '23

Dear all, We will have our first LIRa session for the new academic year next week on Thursday, 7 September 16:30. This will be a hybrid session. If you want to attend online, please use our recurring zoom link: https://uva-live.zoom.us/j/89230639823?pwd=YWJuSnJmTDhXcWhmd1ZkeG5zb0o5UT09 (Meeting ID: 892 3063 9823, Passcode: 421723) You can find the details of the talk below. Speaker: Daniil Khaitovich (ILLC) Date and Time: Thursday, September 7th 2023, 16:30-18:00 Venue: ILLC seminar room F1.15 in Science Park 107 and online Title: Fixing group STIT logic Abstract. STIT is a modal logic of agency to formalize statements of the form "agent i sees to it that φ". One of its extensions, group STIT, allows to reason not only about individual agents, but about coalitions as well. The main advantage of that extension is its expressivity: it was shown that it is strictly more expressive than other popular multi-agent modal logics with coalitions such as Coalition logic or Alternating-time temporal logic. Nevertheless, it does not come for free: group STIT is neither decidable nor finitely axiomatizable. During the talk, we will identify one conceptual problem with group STIT — the way groups and their actions are treated — and show the weaker version of logic to escape it, providing it with finite axiom system and proving its decidability as well. A number of connections with logic of dependence and relativized cylindric algebras will be shown as well. Hope to see you there! The LIRa team

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