Najib Idrissi's math page

Intro

I am an associate professor (maître de conférences) in the Department of Mathematics at Université Paris Cité. I am a member of the Institut de Mathématiques de Jussieu–Paris Rive Gauche (IMJ-PRG) and deputy head of the team-project Algebraic Geometry & Topology (TGA). Moreover, I am a junior member of the Institut Universitaire de France (IUF) for the period 2025—2030.

I am the scientific coordinator of the ANR Young Researcher project “Structure and Homotopy of Configuration Spaces” (SHoCoS).

I received my PhD in 2017 from Université de Lille under the supervision of Benoit Fresse, and my Habilitation to Supervise Research (HDR) in 2025 from Université Paris Cité. More details can be found in my CV.

My main research interests lie in the theory of operads and their applications to algebraic topology and homological algebra. I am particularly interested in configuration spaces of manifolds, their connections with graph complexes, and the invariants they define. More recently, I have also been exploring the phenomenon of representation stability.

My full last name is “Idrissi-Kaïtouni” and you may find this spelling in some places, e.g., my email address.

A collective open letter on the reconstruction of universities in Gaza. This letter was also published in the April 2025 edition of the French Math Society’s Gazette.

Contact

Research

See also:  arXiv,  HAL, MathSciNet, zbMATH,  ORCID.

Preprints

  1. Plethysm for characters of relative operads and PROPs

    Authors
    N. I., Erik Lindell.
    Publication
    Preprint v1, 32 p.
    Online on
    Online on .
    Full text
    Full text.
    arXiv:2505.05910
    arXiv:2505.05910.
    hal-05061606
    hal-05061606.
    Source
    Source.
  2. Configuration Spaces of Surfaces

    Authors
    Ricardo Campos, N. I., Thomas Willwacher.
    Publication
    Preprint v2, 50 p.
    Online on
    Online on .
    Updated on
    Updated on .
    Full text
    Full text.
    arXiv:1911.12281
    arXiv:1911.12281.
    hal-02423726
    hal-02423726.
  3. A model for framed configuration spaces of points

    Authors
    Ricardo Campos, Julien Ducoulombier, N. I., Thomas Willwacher.
    Publication
    Preprint v2, 47 p.
    Online on
    Online on .
    Updated on
    Updated on .
    Full text
    Full text.
    arXiv:1807.08319
    arXiv:1807.08319.
    hal-03835341
    hal-03835341.

Publications

  1. Homotopy Prefactorization Algebras

    Authors
    N. I., Eugene Rabinovich.
    Publication
    In: Res. Math. Sci. 11.45 (2024).
    Online on
    Online on .
    Accepted on
    Accepted on .
    Updated on
    Updated on .
    Full text
    Full text.
    10.1007/s40687-024-00456-9
    10.1007/s40687-024-00456-9.
    arXiv:2304.13011
    arXiv:2304.13011.
    hal-04082483
    hal-04082483.
    MR4763063
    MR4763063.
    Zbl07875603
    Zbl07875603.
  2. Non-formality of Voronov's Swiss-Cheese operads

    Authors
    N. I., Renato Vasconcellos Vieira.
    Publication
    In: Q. J. Math. 75.1 (2024), pp. 63-95.
    Online on
    Online on .
    Accepted on
    Accepted on .
    Updated on
    Updated on .
    Full text
    Full text.
    10.1093/qmath/haad041
    10.1093/qmath/haad041.
    arXiv:2303.16979
    arXiv:2303.16979.
    hal-04053257
    hal-04053257.
    MR4732946
    MR4732946.
    Zbl07936839
    Zbl07936839.
    Source
    Source.
  3. Real Homotopy of Configuration Spaces: Peccot Lecture, Collège de France, March & May 2020

    Author
    N. I.
    Publication
    Lecture Notes in Mathematics 2303. Cham: Springer, 2022. 210 pp. ISBN: 978-3-031-04427-4.
    Online on
    Online on .
    Accepted on
    Accepted on .
    Updated on
    Updated on .
    10.1007/978-3-031-04428-1
    10.1007/978-3-031-04428-1.
    hal-03821309
    hal-03821309.
    MR4461096
    MR4461096.
    Zbl07529469
    Zbl07529469.
  4. Boardman–Vogt resolutions and bar/cobar constructions of (co)operadic (co)bimodules

    Authors
    Ricardo Campos, Julien Ducoulombier, N. I.
    Publication
    In: High. Struct. 5.1, pp. 293–366 (2021), 74 pages.
    Online on
    Online on .
    Accepted on
    Accepted on .
    Updated on
    Updated on .
    Full text
    Full text.
    10.21136/HS.2021.09
    10.21136/HS.2021.09.
    arXiv:1911.09474
    arXiv:1911.09474.
    hal-01786218
    hal-01786218.
    MR4367224
    MR4367224.
    Zbl7482172
    Zbl7482172.
  5. Formality of a higher-codimensional Swiss-Cheese operad

    Author
    N. I.
    Publication
    In: Algebr. Geom. Topol. 22.1 (2022), pp. 55–111.
    Online on
    Online on .
    Accepted on
    Accepted on .
    Updated on
    Updated on .
    Full text
    Full text.
    10.2140/agt.2022.22.55
    10.2140/agt.2022.22.55.
    arXiv:1809.07667
    arXiv:1809.07667.
    hal-01878406
    hal-01878406.
    MR4413816
    MR4413816.
    Zbl07518301
    Zbl07518301.
  6. Curved Koszul duality of algebras over unital versions of binary operads

    Author
    N. I.
    Publication
    J. Pure Appl. Algebra 227.3 (2023).
    Online on
    Online on .
    Accepted on
    Accepted on .
    Updated on
    Updated on .
    Full text
    Full text.
    10.1016/j.jpaa.2022.107208
    10.1016/j.jpaa.2022.107208.
    arXiv:1805.01853
    arXiv:1805.01853.
    hal-01786218
    hal-01786218.
    MR4477956
    MR4477956.
    Zbl07595193
    Zbl07595193.
  7. Configuration Spaces of Manifolds with Boundary

    Authors
    Ricardo Campos, N. I., Pascal Lambrechts, Thomas Willwacher.
    Publication
    Astérisque 449 (2024), ISBN: 978-2-85629-990-6.
    Online on
    Online on .
    Accepted on
    Accepted on .
    Updated on
    Updated on .
    Full text
    Full text.
    10.24033/ast.1222
    10.24033/ast.1222.
    arXiv:1802.00716
    arXiv:1802.00716.
    hal-01721634
    hal-01721634.
    MR4764220
    MR4764220.
    Zbl07882597
    Zbl07882597.
  8. The Lambrechts–Stanley Model of Configuration Spaces

    Author
    N. I.
    Publication
    In: Invent. Math. (2019) 216.1, pp. 1–68.
    Online on
    Online on .
    Accepted on
    Accepted on .
    Updated on
    Updated on .
    Full text
    Full text.
    10.1007/s00222-018-0842-9
    10.1007/s00222-018-0842-9.
    arXiv:1608.08054
    arXiv:1608.08054.
    hal-01438861
    hal-01438861.
    MR3935037
    MR3935037.
    Zbl07051043
    Zbl07051043.
  9. Opérades et Structures Commutatives à Homotopie Près

    Author
    N. I.
    Publication
    In: Grad. J. Math. (2016) 1.1, pp. 9–17.
    Online on
    Online on .
    Full text
    Full text.
    hal-03997161
    hal-03997161.
    MR3848667
    MR3848667.
    Zbl1497.18028
    Zbl1497.18028.
    Journal
    Journal.
  10. Swiss-Cheese Operad and Drinfeld Center

    Author
    N. I.
    Publication
    In: Israel J. Math. (2017) 221.2, pp. 941–972.
    Online on
    Online on .
    Accepted on
    Accepted on .
    Updated on
    Updated on .
    Full text
    Full text.
    10.1007/s11856-017-1579-7
    10.1007/s11856-017-1579-7.
    arXiv:1507.06844
    arXiv:1507.06844.
    hal-01438863
    hal-01438863.
    MR3704940
    MR3704940.
    Zbl06808424
    Zbl06808424.

Theses

  1. Structure of Configuration Spaces

    Author
    N. I.
    Publication
    Habilitation à Diriger des Recherches (HDR), Université Paris Cité.
    Online on
    Online on .
    Full text
    Full text.
    Source
    Source.
    tel-05082275
    tel-05082275.
    Defense
    Defense.
  2. Operadic Formality and Homotopy of Configuration Spaces

    Author
    N. I.
    Publication
    Doctoral thesis, Université de Lille.
    Online on
    Online on .
    Full text
    Full text.
    Source
    Source.
    tel-01731389
    tel-01731389.
    University
    University.
    Defense
    Defense.
  3. Homologie et complexes de déformations d’opérades $E_n$

    Author
    N. I.
    Publication
    Master's thesis, Université Paris Diderot.
    Online on
    Online on .
    Full text
    Full text.

Teaching for 2025−2026

  1. Algèbre (2025−2026)

    Institution
    Université Paris Cité.
    Cursus
    M1 Mathématiques-Informatique Cryptographie (S1).
    Responsibilities
    Lectures: 24h. Exercise sessions: 33h.
    Notes
    Notes.
    TD1
    TD1.
    TD2
    TD2.
    TD3
    TD3.
    TD4
    TD4.
    TD5
    TD5.
    TD6
    TD6.
    TD7
    TD7.
    TD8
    TD8.
    CC1 (corrigé)
    CC1 (corrigé).

Recent talks

  1. Séminaire ART @ Université de Strasbourg

    Title
    TBA.
    Event
    Séminaire ART.
    Location
    Université de Strasbourg.
    On
    On .
    Event page
    Event page.
  2. Soutenance Habilitation à Diriger des Recherches (HDR) @ Université Paris Cité

    Title
    Structure of Configuration Spaces.
    Event
    Soutenance Habilitation à Diriger des Recherches (HDR).
    Location
    Université Paris Cité.
    On
    On .
    Full text
    Full text.
    Slides
    Slides.
  3. Seminar @ University of Copenhagen

    Title
    (Non-)formality of Swiss-Cheese operads.
    Event
    Seminar.
    Location
    University of Copenhagen.
    On
    On .
  4. Séminaire de topologie @ Université de Lille

    Title
    (Non-)formalité des opérades Swiss-Cheese.
    Event
    Séminaire de topologie.
    Location
    Université de Lille.
    On
    On .
    Event page
    Event page.
  5. Topology Intercity Seminar (TopICS) @ Utrecht Universiteit

    Title
    (Non-)formality of Swiss-Cheese operads.
    Event
    Topology Intercity Seminar (TopICS).
    Location
    Utrecht Universiteit.
    On
    On .
    Event page
    Event page.
    Notes
    Notes.
  6. Topology seminar @ Università degli studi di Roma "Tor Vergata"

    Title
    (Non-)formality of Swiss-Cheese operads.
    Event
    Topology seminar.
    Location
    Università degli studi di Roma "Tor Vergata".
    On
    On .
    Event page
    Event page.
    Notes
    Notes.
  7. Séminaire "Des Mathématiques" @ ENS de Paris

    Title
    De l'ordre dans les tresses.
    Event
    Séminaire "Des Mathématiques".
    Location
    ENS de Paris.
    On
    On .
    Event page
    Event page.
    Notes
    Notes.
  8. Algebra Days in Caen 2024: Algebraic aspects of configuration spaces and moduli spaces @ Université de Caen Normandie

    Title
    Operadic structure of configuration spaces (mini-course).
    Event
    Algebra Days in Caen 2024: Algebraic aspects of configuration spaces and moduli spaces.
    Location
    Université de Caen Normandie.
    On
    On .
    Event page
    Event page.
  9. Workshop Alps 2024 @ Sainte-Foy-Tarentaise

    Title
    Formality and non-formality of the Swiss-Cheese operad.
    Event
    Workshop Alps 2024.
    Location
    Sainte-Foy-Tarentaise.
    On
    On .
    Event page
    Event page.
    Notes
    Notes.
  10. Séminaire Bourbaki du vendredi @ Institut Henri Poincaré

    Title
    Espaces de modules de courbes et construction de classes caractéristiques.
    Event
    Séminaire Bourbaki du vendredi.
    Location
    Institut Henri Poincaré.
    On
    On .
    Event page
    Event page.
    Notes
    Notes.

Recent blog posts

  1. Appointment at the Institut Universitaire de France 🏛️

    Published
    Published .
  2. Habilitation defended successfully 🥳

    Published
    Published .
    Full text
    Full text.
    Slides
    Slides.
    Source
    Source.
  3. Fun with DALL-E 2 🤖

    Published
    Published .
  4. ANR Young researcher project “Structure and Homotopy of Configuration Spaces” (SHoCoS) 📜

    Published
    Published .
  5. “Real Homotopy of Configuration Spaces” is out 📕

    Published
    Published .
  6. LaTeX shenanigans 🖥️

    Published
    Published .
    Source
    Source.
  7. Using math software for teaching calculus 🧮

    Published
    Published .
  8. Peccot Lecture notes accepted in Lecture Notes in Mathematics

    Published
    Published .
    10.1007/978-3-031-04428-1
    10.1007/978-3-031-04428-1.
  9. Naming news for 2022

    Published
    Published .
  10. Email hell

    Published
    Published .