*Definitional Proof-Irrelevance without K*in

*46th ACM SIGPLAN Symposium on Principles of Programming Languages (POPL 2019)*. Gilbert, Gaëtan, Cockx, Jesper, Sozeau, Matthieu & Tabareau, Nicolas.

News

You are on Matthieu Sozeau's website, that's me on the right.
Commits are worth a thousand words on my github.

- I will be coorganizing the EPIT 2020 Spring School with Nicolas Tabareau on Homotopy Type Theory, at Oléron, May 25-29 2020

- October: Definitional Proof-Irrelevance without K [1] has been accepted at POPL'19. We present a version of definitionally strict propositions compatible with univalent models. Soon to be found in Coq!
- September-November: MPRI 2.7.2 lecture on proof assistants.
- September: we got the distinguished paper award for our paper "Equivalences for Free!" [2] at ICFP'18.
- September: I am part of the LSFA 2018 program comittee, which will happen in Fortaleza, Brazil in September 2018.
- September: I am part of the TyDe 2018 program comittee colocated with ICFP 2018 in St. Louis, MI.
- August: introductory lecture on Dependent Type Theory at the EUTYPES summer school 2018.
- July: I was part of the ITP 2018 program comittee, and co-organizing the Coq Workshop at FLoC 2018.
- June: I gave an invited talk [3] at the TYPES 2018 conference in Braga, Portugal, June 18-21.
- April: I was an examiner of Amin Timany's PhD, who defended successfully his thesis in KU Leuven, Belgium.
- April 26th: I gave a guest lecture [4] on dependent pattern-matching and Equations at the University of Saarland.
- April 10-11th: participated in the pi.r2 days in Fontainebleau and gave a general talk on Coq as "An Environment for Programming with Dependent Types, take II". Our team is a quite interesting mix!
- April: our paper on Cumulative Inductive Types [516] was accepted at FSCD'18.
- April: our paper on Certified Meta-Programming with Typed Template Coq [6] was accepted at ITP'18.
- March: submitted papers on Equations Reloaded [715], an effective ETT to ITT translation [8] and Equivalences for Free! to ICFP.
- January: I attended the EUTypes meeting in Nijmegen where I gave a short talk on handling of recursion in Equations [9].
- January: I attended POPL 2018, PEPM, CPP and CoqPL as well. Giving a presentation + poster at PEPM 2018 on Equations [10], a talk on Typed Template Coq [11] at CoqPL'18, along with the traditional Coq developer session [12].

- November: participated to the Géocal-LAC days in Nantes, and gave a talk on cumulative inductives types [13].
- October: Coq 8.7 was released, including cumulative inductive types. With Amin Timany, we proved the consistency [14] of this extension using a set-theoretic model.
- October: released Equations version 1.0beta with a handful of examples, and submitted an article on the new version [715], joint work with Cyprien Mangin.
- October: new article on deriving Equivalences for free with Nicolas Tabareau and Eric Tanter.
- October: with Amin Timany, we proved the soundness of our extension of Coq with Cumulative Inductive Types [516].
- September: Théo Winterhalter started his PhD in the CoqHoTT team, co-supervised with Nicolas Tabareau.
- June: branching version 8.7 of Coq, which includes cumulative inductive types and integrates the ssreflect plugin.
- June: gave a lecture at EJCP'17 on Type Theory and Interactive Theorem Proving in Coq [17]
- June: at the 3rd Coq's Implementors Workshop in Carnac, Britany.
- May: at TYPES 2017, for our work on cumulative inductive types [18].
- March-April: working on Cumulative Inductive Types with Amin Timany, adding a cumulativity rule to inductives, simulating template polymorphism.
- January-March: MPRI lecture on proof assistants.
- January: Attended CPP 2017, POPL 2017 and CoqPL'17, and had a blast! Greg and Andrew presented our work on CertiCoq [19] there.

- November: we released Coq version 8.6beta1: A Better, Faster, Stronger Rooster!
- November: our paper [20] on the HoTT library got accepted at CPP 2017!.
- November: our presentation on CertiCoq was accepted at CoqPL'17!
- October: the extended version of our paper on was accepted at JFP.
- August: at the ITP 2016 conference and Coq Workshop 2016 in Nancy, where Hugo Herbelin passed me the Coq development coordinator hat [21].
- July: at the Categorical Logic & Univalent Foundations workshop in Leeds, talking about forcing [22]
- July: at ICMS'16, gave a talk on Coq for HoTT [23]
- June: at the DeepSpec kickoff meeting in Princeton, NJ, gave a talk on Coq 8.6 [24] and enjoyed a lot of Coq-related talks!
- May: at the second Coq implementors workshop in Nice, gave a talk on Universes [25] for ML hackers.
- April: our paper [26] on a new call-by-name forcing translation in Type Theory got accepted at LICS.
- March: at the Dagstuhl seminar on "Language Based Verification Tools for Functional Programs", giving a short talk on Equations [27]
- January: Gave a talk [28] at the CoqPL workshop on Coq 8.5
- January: (finally!) released Coq 8.5, including my work on universe polymorphism and primitive projections.

- December-March: Coq lecture at MPRI
- September 1st: Gave a talk [29] on our work on unification with Beta Ziliani at ICFP'15.
- August 1st: at the LFMTP'15 workshop, where Cyprien presented our work on Equations and Predicative System F.
- June 27th-July 3rd: Gave a lecture [30] at the HoTT/UF workshop and attending TLCA'15 in Warsaw.
- June 22-26: first successful Coq coding sprint in lovely Nice, followed by the Coq Workshop
- June 1st: ERC CoqHoTT started!
- May 26th: Gave a lecture [31] on Coq for proving functional programs at the "École de Printemps d'Informatique Théorique" in Fréjus.
- May 8th: Paper on Equations [32] and Predicative System F, joint work with Cyprien Mangin accepted at LFMTP'15.
- May: Paper [33] on a new unification algorithm for Coq, joint work with Beta Ziliani, accepted at ICFP'15. The Coq plugin is here.
- April 29th: Gave a seminar [34] at MIT on our new unification algorithm.
- April 22nd: Released Coq 8.5 beta 2.
- March: Submitted a new version of our work with Nicolas on Internalizing Intensional Type Theory [35].
- January: at POPL'15 in Mumbai, for the first CoqPL workshop, we released Coq 8.5 beta [36].
- December-March 2015: Lecturing on proof assistants at the MPRI.

- November: ERC Starting Grant CoqHoTT got granted! Led by Nicolas Tabareau, it will explore the use of Coq for Homotopy Type Theory.
- October: teaching formal methods of verification at Paris 7.
- September'14: at ICFP'14 as part of the SRC and the Heidelberg Laureate Forum.
- July'14: during the Vienna Summer of Logic, I gave talks at the UNIF workshop on unification in Coq [37], at ITP on universe polymorphism [38] and at the Coq workshop on rewriting strategies [39] and Coq 8.5 [40].
- May'14: I gave a seminar at the XIX AIM in Paris on universe polymorphism [41].
- Apr'14: Gave a seminar at the Deducteam HoTT working group on an Internalization of the Groupoid Model of Type Theory [42].
- Apr'14: Universe Polymorphism in Coq [43] to appear at ITP'14.
- Feb'14: Draft paper on an Internalization of the Groupoid Model of Type Theory [44].
- Jan-Feb'14: Lecturing on proof assistants at the MPRI. My page about the lecture with links to slides and solutions to the exercises.
- Jan'14: Gave a talk [45] with Gérard Huet at POPL'14 for the reception of the 2013 ACM SIGPLAN Software Systems Award by the Coq team.
- Jan'14: Thanks developers and users for a (first, secret,) great Coq Users Meeting at POPL'14, the minutes are available. Looking forward to next year's meeting in Bombay!
- Jan'14: At JFLA'14 and the SMC week on Recent developments in Type Theory in Lyon.

Copyright © 2006-2015 Matthieu Sozeau