GADEPs focused conference: Abelian and iterated integrals and Hilbert 16th problem

IMPA, Rio de Janeiro, 26-30 September 2022

The seminar “Geometry, Arithmetic and Differential Equations of Periods” (GADEPs), started in the pandemic year 2020 and its aim is to gather people in different areas of mathematics around the notion of abelian integrals and periods which are certain multiple integrals. This is the first GADEPs conference  focused on Hilbert 16th problem. It asks on the uniform bound for the number of limit cycles of planar differential equations, and it is still challenging  even for quadratic differential equations. Attempts to approach this conjecture have given origin to many results in holomorphic foliations on complex surfaces and classification of their singularities. The birth of limit cycles after a perturbation of foliations with a first integral is controlled by the zeros of abelian integrals which are the first Melnikov functions of the deformed holonomy map (Poincaré first return map). The infinitesimal Hilbert 16th problem  asks for finding a realistic bound for the number of zeros of abelian integrals, and attempts to understand this, have produced many results in Picard-Lefschetz theory of fibrations and Picard-Fuchs equations. When an abelian integral is identically zero, higher Melnikov functions are expressed as  Chen’s iterated integrals and their study is closely related to the topology of leaves of holomorphic foliations near to those with a first integral.  The conference main core will consist of 5 lecture series which aim to introduce main methods and conjectures of the topic to a broad public and in particular graduate students.

The conference will be in hybrid format and  it will be transmitted through IMPA’s YouTube channel.

> Certificates – Participants <

> Certificates – Speakers <

Live stream of the talks (IMPA’s YouTube Chanel)

Talks Recordings’ Playlist

Group Photo



Hossein Movasati (IMPA, Brazil) – Deformation of foliations with a first integral and Abelian and iterated integrals – Abstract

Note: The speakers marked with an * will give online lectures.

César Camacho (FGV, Brazil)

Marcin Bobieński (University of Warsaw, Poland) – Abstract

Colin Christopher (University of Plymouth, UK) – Darboux Relative Exactness and Pseudo-Abelian IntegralAbstract

Lubomir Gavrilov (University of Toulouse III, France) – Introduction to the center-focus problem for plane polynomial vector fields – Abstract

Daniel Lopez (IME/USP, Brazil) – The monodromy problem for hyperelliptic curves – Abstract

Yulij Ilyashenko (Cornell University, US) – Persistence problems for polynomial foliations, simultaneous uniformization and identical cycles at infinityAbstract

Pavao Mardesic (University of Bourgogne, France) – Darboux Relative Exactness and Pseudo-Abelian IntegralAbstract

Alcides Lins Neto (IMPA, Brazil) –  On the number of solutions of the equation  for which  – Abstract

Jorge Vitório Pereira (IMPA, Brazil) – Effective Liouvillian integration of foliationsAbstract

Jessie Pontigo (Universidad Nacional Autónoma de México) – A bound for the length of iterated integrals in the first non-zero Melnikov function Abstract

Sergei Yakovenko (Weizmann Institute of Science, Israel)* – On Fuchsian equations with a small parameter before the highest derivativeAbstract

Henryk Zoladek (Warsaw University, Poland) – Normal forms of planar vector fieldsAbstract

Online Interview: Robert Roussarie (University of Bourgogne, France)

Hossein Movasati (IMPA)
Younes Nikdelan (UERJ)
Suely Lima (IMPA)

Financial support
The organizing committee has a limited number of financial supports (only per diem and no travel expenses) for young researchers and students. The application deadline is 30 June 2022, with answers to be out by 15 July 2022.  All applicants should fill in the registration form and follow the instructions.



Postal Address: Instituto de Matemática Pura e Aplicada 
Estrada Dona Castorina 110, Jardim Botânico
Rio de Janeiro, RJ, CEP 22460-320, Brasil