Research interests

I am an Assistant Professor at the Institute of Mathematics of the Polish Academy of Sciences (IMPAN) since October 2025. Previously, I was a Teacher-Researcher at Université d’Angers. I did my PhD under the supervision of Anne Pichon, professor at Aix-Marseille Université, and André Belotto, professor at Paris Cité Université.

My research interests lie at the crossroads between complex analytic geometry and topology. More precisely, I am interested in studying the geometry and topology of singularities of complex spaces, with a particular interest in Lipschitz geometry.

Example of a singular space: The Whitney Umbrella in the real three dimensional space. The singular set is precisely the Z axis

Publications

Inner rates of finite morphisms. Mathematische Zeitschrift.

Preprints:

Lipschitz geometry of complex surface germs via inner rates of primary ideals. Accepted for publication in Annales de l’Institut Fourier.
Inner Lipschitz Geometry of Complex Surface Germs with Non-Isolated Singularities: A Complete Classification.

Contact informations

Yenni Cherik

IM PAN Jana i Jędrzeja Śniadeckich 8

Room 210

00-656 Warszawa

Poland

E-mail: ycherik@impan.pl

Talks

Seminar of Geometry and Dynamic in Angers — 08/11/2022: Inner geometry of Milnor fibers.
Winter school in Aussois — 12–16/12/2022: Inner geometry of Milnor fibers.
Geometry and Topology seminar of Marseille — 15/06/2023: Asymptotic curvature concentration in Milnor fibers.
Geometry and applications seminar in Strasbourg — 15/05/2023: Inner geometry of Milnor fibers.
Conference in Granada IberoSing-International — 06–10/11/2023: Asymptotic curvature concentration in Milnor fibers.
Seminar on geometry of singular spaces in Lille — 28/11/2023: Lipschitz geometry of germs of complex surfaces.
Seminar of dynamical system in Toulouse — 01/03/2024: Lipschitz geometry of germs of complex surfaces.
Seminar of Geometry and Dynamic in Angers — 14/05/2024: Lipschitz geometry of germs of complex surfaces.
Seminar of Algebra, Geometry and Topology in Nice — 20/03/2025: Lipschitz geometry of germs of complex surfaces.
Spring School on Singularities in Low-Dimensional and Symplectic Topology — 22-25/04/2025: Lipschitz geometry of germs of complex surfaces.
GKLW mini-workshop in Singularity Theory in Warsaw — 03-04/10/2025: Lipschitz geometry of germs of complex surfaces.
IMPANGA (Algebraic geometry seminar of IMPAN) seminar in Krakow — 05/12/2025: Lipschitz geometry of germs of complex surfaces.
Seminar of Geometry and Dynamic in Angers — 14/05/2024: Lipschitz geometry of complex surface germs with non isolated singularity.
Algebraic geometry seminar of MIMUW in Warsaw — 12/03/2026: Lipschitz geometry of complex surface germs with non isolated singularity.
Conference in Bedlewo: Metric Geometry of Singularities — 04-08/05/2026: Lipschitz geometry of complex surface germs with non isolated singularity.
GKLW mini-workshop in Singularity Theory in Warsaw — 15-16/05/2026: Lipschitz geometry of complex surface germs with non isolated singularity.

Scientific Events

Ecole Mathématique Africaine, 2–14/11/2025, El Oued, Algeria: I co-organised a CIMPA School in Algeria on the theme of surfaces and gave an introductory course in algebraic topology. Here are my course notes: Course 1, Course 2, Course 3, First exercise session, and Second exercise session.

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