60LB Geometry and Singularities - 60th anniversary of Lev Birbrair

16.07.2023 - 22.07.2023 | Będlewo

60LB Geometry and Singularities - 60th anniversary of Lev Birbrair

The present conference is organised in honour of prof. Lev Birbrair on the occasion of his 60th birthday. The main topics will be:

  • Lipschitz Geometry of Singularities,
  • Real Algebraic Geometry,
  • Algebraic Theory of Singularities,
  • Geometry and Topology.

Lev Birbrair was one of the first mathematicians to work on the classification of semi-algebraic sets up to bi-Lipschitz equivalence. He pointed out three natural approaches of Lipschitz classification: with respect to the inner (geodesic) metric, the outer metric, and ambient Lipschitz classification. His first and very important contribution is the theory of Hölder complexes giving a complete Lipschitz classification of semi-algebraic surface germs with respect to the inner metric. Together with T. Mostowski he introduced the notion of Lipschitz Normal Embedding which became very important in recent research. Together with A. Fernandes he discovered two very interesting phenomena: fast loops and separating sets whose existence is a serious obstruction for metrical conicalness of complex surface germs. Using the fast loop technique Birbrair, Fernandes and Neumann showed that the germs of surfaces can be ambient topological equivalent, but not inner bi-Lipschitz equivalent. Next, Birbrair, Neumann and Pichon obtained a complete description of the inner Lipschitz geometry of germs of normal surfaces, called a refined thick and thin decomposition which is a complete bi-Lipschitz invariant with respect to the inner metric. The most recent contribution of Lev Birbrair in Lipschitz Geometry is the creation of Metric Knot Theory together with A. Gabrielov.

The events take place onsite with the possibility of partial participation online.

The deadline for the registration is June 16th 2023. Please note that the accomodation costs amount to 300 euros (subject to exchange rates changes, the cost in Polish currency is 1440PLN; the hotel provides all the meals). At this moment we cannot guarantee any financial support. According to the latest updates, a single room is 240 PLN/day, while a shared room (two people) is 210 PLN/day.

A conference fee meant to cover the anniversary dinner and conference materials is fixed at 180PLN/40 euros.

The payment can be done onsite, by cash or card, in PLN or EUR, or by bank transfer of the total amount to the following account:

Bank Gospodarstwa Krajowego
Al. Jerozolimskie 7
00-955 Warszawa, Poland 
IBAN: PL 48 1130 1017 0020 1467 1520 0002 (payment in PLN)
IBAN: PL 80 1130 1017 0020 1467 1520 0008 (payment in EUR)

Beneficiary (Account Holder) Name: Instytut Matematyczny PAN
Beneficiary Address: ul. Śniadeckich 8, 00-656 Warszawa
Country: Poland

Confirmed invited speakers: Juan José Nuño Ballesteros, Alexandre Fernandes, Javier Fernandez de Bobadilla, Andrei Gabrielov, Zbigniew Jelonek, Krzysztof Kurdyka, Adam Parusiński, Maria Pe Pereira, Anne Pichon (online), José Edson Sampaio,

You may contact the organisers using the official conference e-mail: 23-birbrair60@impan.pl

Join online:


Banach Center, Institute of Mathematics of the Polish Academy of Sciences; Strategic programme Excellence Initiative at the Jagiellonian University (ID.UJ), Jagiellonian University; Intitute of Mathematics of the Jagiellonian University; Jagiellonian University - Faculty of Mathematics and Computer Science.

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