12th ALGA Meeting

IMPA, Rio de Janeiro, de 13/08 até 17/08


Rio de Janeiro has a large number of hotels. Lately, for the main congresses, we have been using Hotel Acapulco, Everest Rio Hotel, Everest Park Hotel, Hotel Debret, Hotel Vermont, among others. To take advantage of IMPA´s special rate, please contact Ms. Michele Leite at MMX Eventos – micheleleite@mmxcongressos.com – phone: + 55 21 2210-1732 or visit their homepage at: www.mmxcongressos.com

For other type of accommodation like hostels and bed and breakfast, we suggest the following:

Pouso Verde Bed & Breakfast (very close to IMPA and strongly recommended)
Rua Caminhoá, 14 – Jardim Botânico
Tel: + 55 21 2529-2942 , + 55 21 99971-0511
e-mail: pousoverde@globo.com



Meiai Hostel:
R. Guilhermina Guinle, 127 – Botafogo
Tel: 55(21) 3495-4481


Pousada Girassol
Travessa Angrense, 25 A – Copacabana (entre Santa Clara e Raimundo Correa)
Tel: 55(21)2256-6951 / Fax: 55(21) 2286-5652
E-mail: pousada@girassolpousada.com.br


Lagoa Guest House
Rua do Humaitá, 392 – Humaitá
Tel: 55(21) 3518-9000
E-mail: contato@lagoaguesthouse.com


Che Lagarto Ipanema
Rua Paul Redfern 48 – Ipanema
Tel: 55(21) 2512-8076

Leblon Spot (associado à Hostelling International)
Rua Dias Ferreira, 626 – Leblon
Tel: 55(21) 2137-0090
E-mail: contact@leblonspot.com

Please check availability and prices directly with them


Hotels and Flats – Rio de Janeiro







List of all Registered Partipants


Organizing Committee

Eduardo Esteves (IMPA)
Abramo Hefez (UFF)
Bernd Ulrich (Purdue)
Dan Edidin (Misoouri)
Ragni Piene (Oslo)



Group Picture

Talks – August 13

Talks – August 14

Talks – August 15

Talks – August 16

Talks – August 17





Price for Registration

Foreign and Brazilian Participants
Professors (Ph.D´s) / Professores (Doutores)
Students (Master and Ph.D) / Alunos (Mestrado e Doutorado)
IMPA´s Students / Alunos do IMPA
R$ 40.00


Vikraman Balaji (Chennai Mathematical Institute, Chennai)
On holonomy and restriction theorems for stable bundles on projective varieties

Susan Colley (Oberlin, USA)
Combinatorial Determination of Severi Degrees

Terence Gaffney (Northeastern, USA)
Connections between Commutative Algebra and Singularities Through the Lens of bi-Lipschitz Equivalence

Arnaldo Garcia (IMPA, Brazil)
On towers over finite fields and Ihara’s quantity

Philippe Gimenez (Valladolid, Spain)
On the multigraded Betti numbers of an edge ideal

Lothar Goettsche (ICTP, Italy)
Refined curve counting on surfaces

Shiro Goto (Meiji, Japan)
Ulrich Ideals And Modules, I

Dan Grayson (Illinois, USA)
Computations in intersection theory

Anthony Iarrobino (Northeastern, USA)
When do two nilpotent matrices commute?

Luc Illusie (Paris, France)
Actions of algebraic groups and mod l étale equivariant cohomology algebras : Quillen’s theory revisited

Trygve Johnsen (Tromso, Norway)
Codes and matroid structures

Hajime Kaji (Waseda, Japan)
A tangential trisecant lemma

Gary Kennedy (Ohio, USA)
Milnor Fibers Associated to Quasi-Ordinary Surfaces

Sandor Kovacs (Seattle, USA)
Rational pairs and thrifty resolutions

Aryampilly J. Parameswaran (Tata Institute of Fundamental Research, Mumbai)
Picard bundles and Brill-Noether loci in the compactified jacobian of a nodal curve

Claudia Polini (Notre Dame, USA)
Rees algebras and Singularities

Lorenzo Robbiano (Genova, Italy)
Detecting Hidden Images Using Algebraic Schemes

Vivek Shende (MIT, USA)
Counting nodal curves on surfaces

Anurag Singh (Utah, USA)
Local cohomology supported at determinantal ideals

Vijayalaxmi Trivedi (Tata Institute of Fundamental Research, Mumbai)
Hilbert-Kunz multiplicity and Hilbert-Kunz slope

Ilya Tyomkin (Ben Gurion, Israel)
Zariski’s theorem via tropical geometry

Israel Vainsencher (UFMG, Brazil)
Degrees of Noether-Lefschetz loci

Keiichi Watanabe (Nihon, Japan)
Ulrich Ideals and Modules, II

Sebastian Xambó (Catalunya, Spain)
ALGA Connections in Spain



Visa Information

I wish to remind that US and Mexican citizens must apply for a visa to come to Brazil, concerning Europeans citizens it depends of the country, so please get in touch with the nearest Brazilian Consulate in your country in this direction.

A natural question would be the type of visa you need. Since you will not be receiving income or employment in Brazil, a tourist visa is just fine.

In order to avoid bureaucracy delays, I advise you to apply for the tourist visa as soon as possible.

Please let me know if you need an official letter of invitation sending an e-mail to dac@impa.br