## News

*20.11.2018*

Two papers coauthored by IRIF members will be presented at QIP’19, the main conference for theoretical quantum information research. Topics include efficient quantum algorithms for both algebraic and distributed problems.

*10.11.2018*

The first meeting of the French-Chinese research project **Verification Interaction Proof** will take place in Paris at IRIF on **November 19-24**. Registration is free but mandatory.

*17.11.2018*

Four papers coauthored by IRIF members will be presented at POPL’19, the main conference on programming languages and programming systems. The papers' topics are game semantics, proof theory, gradual typing, and consistency for concurrent computations.

**Games**are mathematical objects used for modeling situations in which several participants/players interact, and each of them aims at fulfilling a personal goal. Real games such as chess or go are cases in which there are two players which are opponent. Games occur in computer science for modeling the logical duality between conjunction and disjunctions, or for defining particular families of complexity classes. Games appear in verification for describing how a system has to react to the environment (the opponent) in order to perform what it has been designed for.

**Gradual typing**is a technique that allows the programmer to control which parts of a program check their type correctness (i.e., that apples are added to apples) before execution and which parts check it during their execution instead. It is often used to

*gradually*add the before-execution check to dynamic languages, like JavaScript, which perform the check only at run-time, since it is generally better to find errors before the execution of a program rather than during its execution.

**Proof theory**is the branch of mathematical logic that studies proofs as mathematical objects. In particular, proof are syntactic constructions built from axioms and inference rules. Relevant to computer science are the studies of computational and complexity aspects of proofs.

**Memory consistency models**characterize the effect of concurrent invocations to a library implementing a shared state, e.g., a queue or a key-value map. Strong consistency means that the results of concurrently-executed invocations match the results of some serial execution of those same invocations. Since strong consistency carries a significant penalty on performance, modern implementations provide weaker guarantees known as weak consistency models, e.g., eventual or causal consistency.

*19.11.2018*

IRIF has the great pleasure to welcome **Mahsa Shirmohammadi**, researcher scientist (CNRS) from LIS, who is visiting IRIF for six months and who is an expert in the analysis and verification of timed, counter and probabilistic systems.

*9.11.2018*

The first session of a series of seminars **Graph Theory in Paris** will be hosted by IRIF. There will be two seminars by Monique Laurent and Lex Schrijver on **November 23, at 2pm**, in Amphi Turing of Sophie Germain building.

*20.11.2018*

One paper coauthored by Laurent Feuilloley while he was PhD student at IRIF will be presented at SODA’19, the main conference in algorithm design. The paper provides lower bounds for the fundamental problem of text indexing with mismatches and differences using the Strong Exponential Time Hypothesis.

*12.11.2018*

**IRIF** and PCQC are partners in the EU Flagship project Quantum Internet Alliance (QIA) and in charge of delivering the QIA's blueprint for the future of quantum communications.
The EU selected nineteen research projects, and ten of them are based on French teams.

*10.11.2018*

The last plenary meeting of GDRI Logique Linéaire will take place at IRIF, December 3-5. The program will consist of talks given by members of the GDRI.

*10.11.2018*

We are delighted to host as part of our IRIF Distinguished Talks Series **Maurice Helihy** (Brown University)
on **Nov. 16, 10:30** for a talk entitled “Atomic Cross-Chain Swaps”.

*5.11.2018*

Amélie Gheerbrand and Cristina Sirangelo from IRIF co-organize with L. Libkin, L. Segoufin, and P. Senellart, the *2019 Spring School on Theoretical Computer Science* (**EPIT**) on *Databases, Logic and Automata*, to happen the **7-12 April 2919** in Marseille. Preregistration before **13 January 2019**.

*5.11.2018*

The Journées PPS 2018 will take place on *Thursday 8 and Friday 9 November*, room 3052, building Sophie Germain.

*12.10.2018*

IRIF has the great pleasure to welcome a new research scientist (CNRS): **Claire Mathieu**, an expert in algorithms, particularly the design of approximation schemes for NP-hard combinatorial.

*12.10.2018*

IRIF has the great pleasure to welcome a new professor (Paris Diderot): **Pierluigi Crescenzi**, an expert in graph algorithms, particularly in the analysis of real-world complex networks.

*9.10.2018*

The paper *“Equivalences for Free : Univalent Parametricity for Effective Transport”* of Matthieu Sozeau (IRIF), with his coauthors Nicolas Tabareau and Eric Tanter, has been selected as a distinguished paper of the ICFP conference.

*8.10.2018*

On **October 8-11** IRIF organizes a joint meeting of 3 projects which are closely related: GDRI-LL, CRECOGI, and ELICA. Everybody is welcome to attend.

*8.10.2018*

Jean Krivine (researcher at IRIF) will lead a public debate about Artificial Intelligence at the “Festival Maths en Ville” of Saint-Denis. It will take place on the 11/10/2018 at the theater “L'écran”, starting at 19.30.

*7.10.2018*

Jean-Eric Pin, CNRS senior researcher at IRIF, is awarded the Arto Salomaa prize for his outstanding contribution to the field of Automata Theory.

*7.10.2018*

IRIF is having its **back-to-work-day** on **October 15th**. In the morning, there will be a PhD student session, and in the afternoon a series of talks given by new faculty and CNRS members.

*5.10.2018*

IRIF is seeking excellent candidates for about **10 postdoctoral positions** in all areas of the Foundations of Computer Science.

*4.10.2018*

In an article of October of Communications of the ACM, Jean-François Abramatic, Roberto Di Cosmo (IRIF) and Stefano Zacchiroli (IRIF) explain the mission of the Software Heritage project.

*15.9.2018*

IRIF co-organizes the Workshop on Emergent Algorithms and Network Dynamics (Wendy) that will take place at Institut Henri-Poincaré in Paris on **October 10-11, 2018**.
Registration is free but mandatory.

*14.9.2018*

The **October 2**, IRIF organizes the next Annual workshop of the French Working Group on Complexity and Algorithms (CoA). This year, the workshop will consist of a series of introductory and survey talks about various hot topics in algorithms, including Blockchains, Machine Learning, Sum-of-Square, etc.

*11.9.2018*

Back-to-work day of the "Algorithms and discrete structures" pole, which gathers the research groups Algorithms and complexity, Combinatorics, Complex Systems, Networks, and Distributed Computing and Theory and algorithmics of graphs
on September 11, 2018, room 3059, 9h30-16h15.

*7.9.2018*

The EU QuantAlgo project workshop will be held in Paris at IRIF **September 25-28, 2018**. This is a joint workshop with the IRIF-IQC Cooperation project between CNRS and U. Waterloo.
QuantAlgo project aims to combine research on the fundamentals of quantum algorithms with the development of new applications.

*4.9.2018*

IRIF organizes the workshop Quantifiers and duality that will take place at Amphi Turing (building Sophie Germain, University Paris Diderot) on the **2018/09/11**. Registration is free but mandatory.

*9.8.2018*

IRIF organizes the 7th FILOFOCS (French-Israeli Laboratory on Foundations of Computer Science)
workshop which will be held at the institut Henri Poincaré (IHP), on **3-5 October, 2018**.
A preliminary list of speakers in now available and
registration (mandatory, but free) is now open.

*1.8.2018*

At the occasion of the retirement of Michel Habib and in celebration of his
achievements, IRIF organizes a two-day conference “40 années
d'algorithmique de graphes”, **11-12 Oct**, Amphi Turing (Sophie Germain, Univ. Paris Diderot). Free mandatory registration.

*29.7.2018*

Ludovic Patey was awarded the Prix Thiessé de Rosemont / Demassieux for his PhD thesis « Les mathématiques à rebours de théorèmes de type Ramsey », supervised by Laurent Bienvenu and Hugo Herbelin.

*29.7.2018*

IRIF organizes the 59th IEEE Symposium on Foundations of Computer Science (FOCS 2018) on **October 7-9, 2018**.
FOCS is a leading annual conference in Theoretical Computer Science,
and has served in the last 60 years as a venue for announcing the major scientific advances in the field. The list of accepted papers is now available,
and the registration is now open (**deadline for early rate: September 9, 2018**).

*10.7.2018*

Mihaela Sighireanu (IRIF) is organizing the second edition of SL-COMP, a competition of solvers for separation logic. The final results will be presented at ADSL 2018, a workshop of FLOC2018, which will take place in Oxford on the 13.07.18.

**Separation logic**is a language for describing properties and reasoning about programs that use mutable data structures (i.e. memory cells and pointers). Separation logic has a special support for local reasoning, which is the ability to use and compose properties that involve a subset of the data configuration only: it

*separates*the relevant portion of the data structure from the irrelevant one. Local reasoning gives more compact proofs and specifications for imperative programs than with prior formalisms. Furthermore, it helps with the scalability of proofs done in automatic and semi-automatic verification and program analysis tools.

*6.7.2018*

Mihaela Sighireanu (IRIF) is co-chair of the 18th International Workshop on Automated Verification of Critical Systems (AVOCS) which will take place in Oxford from 18.07.18 to 19.07.18 as part of FLOC2018.

*29.6.2018*

Raphaëlle Crubillé (PhD student IRIF) will present at
LICS 2018 an analytic account of the discrete probabilities fragment of a denotational model for higher-order programming with general probabilities, hopefully a first step towards proving that this model is fully abstract.

*27.6.2018*

Berenice Delcroix-Oger (IRIF) participated to the annual festival **Salon Culture & Jeux Mathématiques 2018**. On the following video (1:50), she presents a funny game where mathematics help you perform magic tricks!

*15.6.2018*

Amina Doumane (former PhD student at IRIF, now at LIP) was awarded the **Ackermann prize of EACSL** for her PhD thesis entitled On the infinitary proof theory of logics with fixed points.

*6.6.2018*

Today Roberto Di Cosmo (professor at IRIF) with a ceremony at UNESCO opened to the public the archives of **Softwareheritage.org**, a worldwide initiative to create a universal library of computer programme source codes since the dawn of the digital age.

*6.6.2018*

We are delighted to host as part of our IRIF Distinguished Talks Series
**Christos Papadimitriou** (Columbia University) on **July 13, 10:30** for a talk entitled *“A computer scientist thinks about the Brain”*.

*6.6.2018*

Delia Kesner (IRIF) and Matthieu Sozeau (IRIF) will both give
invited talks entitled *“Multi Types for Higher-Order languages”*
and *“The Predicative, Polymorphic Calculus of Cumulative Inductive Constructions and its implementation”*
at TYPES 2018, held in Braga (Portugal), June 18-21.

*1.6.2018*

Claire Mathieu (IRIF associate member) organizes a 1-day colloquium on Approximation algorithms and networks at Collège de France on ** June 7**. This is part of the Chair in Informatics and Computational Sciences at College de France in association with INRIA.

*31.5.2018*

Paul-André Melliès (IRIF) will present at LICS 2018
his work on ribbon tensorial logic, a primary logic designed to reveal the secret topology of reasoning.
This is the first time that logical proofs are faithfully translated into topological
tangles using functorial knot theory.

*30.5.2018*

**« Tous femmes de numérique ! »** Après leur rencontre avec **4 informaticiennes de l’IRIF**, 14 lycéennes du Lycée Jules Ferry ont expliqué à leurs camarades l’exposition permanente du Palais de la découverte sur l’informatique et les sciences du numérique le 29/05.

*25.5.2018*

Marie Kerjean (PhD student IRIF) will present at LICS 2018
a logical account for linear partial differential equations.
With this work, she unveils a bridge between mathematical physics and proof theory,
paving the way for exciting and mutually beneficial transfers of techniques.

*21.5.2018*

Pierre Vial (IRIF) will present at
LiCS 2018 an excerpt of his
PhD work at IRIF
proving that every lambda-term has an infinite linear representation in
the infinitary relational model. This work pioneers a technique that
allows giving a semantic even to unproductive programs.

*11.5.2018*

Amos Korman (IRIF) Amos Korman is co-chairing, and organizing the 6th Workshop on Biological Distributed Algorithms, to be held in London in **July, the 23rd**.

*4.5.2018*

Miklos Santha (IRIF) participates to the conference-debate
*Calcul, communication, simulation et métrologie quantiques : des principes aux réalisations concrètes*
organized by **Académie des sciences** at the Institut de France on ** May 15**.

*27.4.2018*

IRIF is proud to announce that Delia Kesner,
professor of University Paris Diderot and researcher at IRIF, was appointed senior member of IUF.

*23.4.2018*

Six papers coauthored by IRIF members will be presented at the prestigious conference LICS'18 in
Oxford this summer. Topics range from λ-calculus, to Separation Logic…

*6.4.2018*

Victor Lanvin (PhD student of Giuseppe Castagna, IRIF) is awarded the Google PhD fellowship! Through the FSMP, Google will give a significant support to Victor's research work on gradual typing.

*3.4.2018*

The conference Numeration 2018 will be held on **May 22-25** at the Univerity Paris Diderot, and is organized by Valérie Berthé, Christiane Frougny and Wolfgang Steiner from IRIF.

*21.3.2018*

“The Kappa platform for rule-based modeling”, a collaboration between Jean Krivine (IRIF) and researchers from Harvard University,
ENS and Santa Cruz University will be presented at ISMB2018.

*21.3.2018*

The next meeting of the ANR project DESCARTES, aiming at defining a modular approach for distributed computing, will take place at IRIF on **March 28, 2018**. Scientific talks are public.

*21.3.2018*

The next meeting of the ANR project DELTA, conducting research about the new challenges in Logic,
Automata and Transducers, will take place at University Paris Diderot **from 2018/03/26 to 2018/03/28**.
Scientific talks are public.

*8.3.2018*

In the scope of the IRIF Distinguished Talks Series
**Monika Henzinger** (University of Vienna) will give on **April 13** a talk on
*“The state of the art in dynamic graph algorithms”*.

*2.3.2018*

Adrian Kosowski (IRIF), together with Bartek Dudek (University of Wroclaw),
will present at STOC 2018 a new protocol for spreading information
in a population. This is the first time that methods of oscillatory dynamics
are used to solve a basic task of information dissemination.

*27.2.2018*

FSMP offers **20 PhD student positions** in Maths and TCS under
H2020 COFUND project MathInParis. As a member of the FSMP network, IRIF is an eligible hosting lab.
Call for application is open until **April, 1st 2018**. Applicants must be international students, but master students already in France for less than a year are eligible.

*27.2.2018*

Constantin Enea (IRIF) is an organizer of the 2018 edition of the
EPIT **research school**, on the subject of software verification, to he held in Aussois on **May 7-11 2018**.

*7.2.2018*

Peter Habermehl (IRIF) and Benedikt Bollig
(LSV, ENS Paris-Saclay) organize the **research school**
MOVEP (*Modelling and Verification of Parallel Processes*), on **July 16-20** in Cachan.

*5.2.2018*

Université Paris Diderot has opened **three permanent positions** in
Computer Science
(1 professor on Graph and applications, 1 assistant professor on Software Science,
1 assistant professor on Data Science).
Recruited researchers will join IRIF.

*4.2.2018*

Laurent Viennot (IRIF, Inria) is Scientific Curator of the exhibition Informatique et sciences du numérique, at **Palais de la découverte**, starting **March 13, 2018**.

*2.2.2018*

Amina Doumane, now at LIP, was awarded the **“La Recherche” prize** in the Computer Science category for her paper
entitled Constructive Completeness for the linear-time mu-calculus,
a work accomplished during her PhD at IRIF and that appeared in the proceedings of LICS’17.

*1.2.2018*

The first **on-the-fly quantum money transaction** was implemented by researchers in Paris,
including Iordanis Kerenidis. Quantum money is provably unforgeable due to the no-cloning property of quantum information.

*27.1.2018*

The **international French and Argentina CNRS laboratory** called INFINIS
lead by Delia Kesner (IRIF)
and Sergio Yovine (CONICET) is
presented in the CNRS Rio newsletter.

*18.1.2018*

IRIF organizes on **February, 6th** a Scientific Day in memory of Maurice Nivat,
professor at Paris Diderot University and a pionneer of theoretical computer science. Please register.

*11.1.2018*

January the 10th 2018, this is the kick-off meeting of the ANR project FREDDA (FoRmal mEthods for the Design of Distributed Algorithms).

*5.1.2018*

Lucas Boczkowski and Amos Korman
from IRIF, with their co-authors, will present at
ITCS 2018
a non-conditional lower bound on **information dissemination in stochastic populations**.
The paper is the first ever to combine an algorithmic lower bound with a biology experiment in collective behavior.

*19.12.2017*

IRIF and ATOS have started the first Industrial PhD Thesis (CIFRE) on quantum algorithms in France.
The PhD candidate Alessandro Luongo is co-advised by Iordanis Kerenidis and Frédéric Magniez.

*29.11.2017*

Amina Doumane was awarded the Gilles Kahn prize for her PhD thesis entitled « On the infinitary proof theory of logics with fixed points » supervised by Alexis Saurin, David Baelde and Pierre-Louis Curien.

*29.11.2017*

Wenjie Fang was awarded the Honorable Mention of the Gilles Kahn prize for his
PhD thesis entitled « Aspects énumératifs et bijectifs des cartes combinatoires : généralisation, unification et application » and supervised by Guillaume Chapuy and Mireille Bousquet-Mélou.

*27.11.2017*

Scientific Day in memory of Maurice Nivat, professor at Paris Diderot University and a pionneer of theoretical computer science in France and in the world, who passed away on September the 21st, 2017.

*25.11.2017*

**Back-to-work day of the “Automata, Structures, and Verification” pole**, which gathers the research groups Automata and applications and Modelling and verification
on November 25, 2017.

*22.11.2017*

**6th French-Israeli Workshop on Foundations of Computer Science**
on November 22-23, 2017 at Tel-Aviv University, Israel.

*15.11.2017*

2-day workshop on December 7-8:
Closing workshop of ANR project on Restricted Data Access Models
and
1st IRIF-IQC Workshop on Quantum Information Processing (CNRS bilateral collaboration).

*10.10.2017*

Back-to-work day of the “Proofs, programs and systems” pole
on October 12-13, 2017 at room 3052.

*6.10.2017*

Guillaume Lagarde and Sylvain Perifel have solved a 20-year old conjecture related to Lempel-Ziv. This will be presented at the
29th ACM-SIAM Symposium on Discrete Algorithm (**SODA 2018**).

*1.9.2017*

IRIF has the great pleasure to welcome a new assistant professor: Bérénice Delcroix-Oger, an expert in combinatorics and computational algebra.

*15.6.2017*

Victor Lanvin is awarded the first prize for the ACM Student Research Competition Grand Finals, undergraduate category. The prize will be presented on June the 24th at the *Turing Award* Cerimony in San Francisco.

*1.3.2017*

The 5-year ERC project CombiTop of Guillaume Chapuy has started on March 1st, 2017. The purpose of this project is to use the ubiquitous nature of certain combinatorial topological objects called maps in order to unveil deep connections between several areas of mathematics.

*30.1.2017*

Amos Korman has been interviewed by Le Monde for his recent results on ants with several co-autors at IRIF.