The chair Biography and publications Public lectures Guest lecturers Annual summaries Audios and videos News Upcoming Previous Program Equivalencies (1) Xavier Leroy Lecture 5 Nov 2026 09:30 to 11:00 Program Equivalencies (1) Xavier Leroy Seminar 5 Nov 2026 11:15 to 12:15 Program Equivalencies (2) Xavier Leroy Lecture 12 Nov 2026 09:30 to 11:00 Program Equivalencies (2) Xavier Leroy Seminar 12 Nov 2026 11:15 to 12:15 Program Equivalencies (3) Xavier Leroy Lecture 19 Nov 2026 09:30 to 11:00 Program Equivalencies (3) Xavier Leroy Seminar 19 Nov 2026 11:15 to 12:15 Program Equivalencies (4) Xavier Leroy Lecture 26 Nov 2026 09:30 to 11:00 Program Equivalencies (4) Xavier Leroy Seminar 26 Nov 2026 11:15 to 12:15 Program Equivalencies (5) Xavier Leroy Lecture 3 Dec 2026 09:30 to 11:00 Program Equivalencies (5) Xavier Leroy Seminar 3 Dec 2026 11:15 to 12:15 Program Equivalencies (6) Xavier Leroy Lecture 10 Dec 2026 09:30 to 11:00 Program Equivalencies (6) Xavier Leroy Seminar 10 Dec 2026 11:15 to 12:15 Program Equivalencies (7) Xavier Leroy Lecture 17 Dec 2026 09:30 to 11:00 Program Equivalencies (7) Xavier Leroy Seminar 17 Dec 2026 11:15 to 12:15 Next 7 series Filters Event type Event type Lecture (3) Seminar (3) Symposium (1) Academic year Academic year 2026 - 2027 (2) 2025 - 2026 (2) 2024 - 2025 (1) (-) 2023 - 2024 (3) 2022 - 2023 (2) 2021 - 2022 (3) (-) 2020 - 2021 (2) (-) 2019 - 2020 (2) 2018 - 2019 (3) Active filters 2023 - 2024 2020 - 2021 2019 - 2020 2023 - 2024 AI and its challenges Philippe Aghion, Xavier Leroy, Benoît Sagot 28 Sep 2023 Symposium 28 Sep 2023 Control structures : from goto to algebraic effects Xavier Leroy 25 Jan 2024 → 14 Mar 2024 Lecture 25 Jan 2024 → 14 Mar 2024 Control structures : from goto to algebraic effects Xavier Leroy 08 Feb 2024 → 14 Mar 2024 Seminar 08 Feb 2024 → 14 Mar 2024 2020 - 2021 Program logic : when the machine reasons about its software Xavier Leroy 04 Mar 2021 → 15 Apr 2021 Lecture 04 Mar 2021 → 15 Apr 2021 Program logic : when the machine reasons about its software Xavier Leroy 11 Mar 2021 → 15 Apr 2021 Seminar 11 Mar 2021 → 15 Apr 2021 2019 - 2020 Mechanized semantics : when the machine reasons about its languages Xavier Leroy 28 Nov 2019 → 13 Feb 2020 Lecture 28 Nov 2019 → 13 Feb 2020 Mechanized semantics : when the machine reasons about its languages Xavier Leroy 12 Dec 2019 → 13 Feb 2020 Seminar 12 Dec 2019 → 13 Feb 2020