ICM Operator Algebras Satellite Conference - ICMOA

6th Florianópolis-Münster-Ottawa meeting

July 26-30, 2018 in Florianópolis, Santa Catarina, Brazil

This is the 6th conference of a series of mettings that have been organized under cooperation with Florianópolis, Münster and Ottawa.

Here is the history of the first five conferences:
Fields Institute Extended Workshop on Groups and Group Actions in Operator Algebra Theory , University of Ottawa, 12-16 July, 2010.
2011 Brazilian Operator Algebras Symposium (BOAS 2011), Universidade Federal de Santa Catarina, Jurere, Florianópolis, SC, Brazil, January 31 - February 4, 2011.
SFB-Workshop on Groups, Dynamical Systems and C*-Algebras , Münster, August 20-24, 2013.
International Conference on Functional Analysis and Dynamical Systems (FADYS) , Praia dos Ingleses, Florianópolis, February 24-27, 2015.
Workshop on Dynamical Systems and Operator Algebras, May 30 to June 1, 2016, University of Ottawa

This conference is dedicated to the 60th birthday of Prof. Ruy Exel.


Ruy Exel Filho was born in 2nd of July of 1956, son of Ruy Exel (Engineer) and Cecília Exel (English Teacher). In 1976 he finished his Math undergrad studies at the university of São Paulo (USP) where he got influenced by César Polcino towards Pure Algebra. In 1977 he first left São Paulo to take a summer course at IMPA (Rio de Janeiro). There he met Ricardo Mane as a student of Functional Analysis, which then directed his interest towards this field of research. In 1981 he then went to the University of California where he did his PhD under the supervision of Marc Rieffel.

It was also in California that Ruy started one of his main hobbies, the practice of windsurfing.

After his return to Brazil he obtained a pos-doctoral scholarship from FAPESP to attended a special program on Operator Algebras (organised by David Evans) that took place at the University of Warwick, England, during 1986-87. There he met important people from the Operator Algebra world, like Alain Connes, Dick Kadison, Paul Baum, George Elliott, among others. After his return to Brazil in 1987 he started to publish several papers on Operator Algebras and co-related fields.
Im the nineties he was a visiting professor at New Mexico University invited by his colleague, Terry Loring. In this period he started to get interested in the interplay between Operator Algebras and Dynamical Systems.
Due to the violence and tension caused by the big São Paulo metropole, and also motivated by the practice of Windsurfing, Ruy moved to Florianópolis in 1998 -- he is therefore already 20 years here and can be considered already as a ``Manezinho".
In Florianópolis Ruy started to work alone on Operator Algebras and started very soon to call attention of students. He advised in Florianópolis several master and doctoral students, including some of the present organizers of this conference (Alcides, Daniel, Gilles, Giuliano) who are now professors at UFSC.
Ruy Exel is considered today one of the lead experts on Operator Algebras. His impressive curriculum contains a list of roughly 100 papers published in top rated journals, many of them in collaborations with well-known stablished researchers all around the world, many of those are present here today. And his book entitled ``Partial actions, Fell bundles and applications'' summarises the main important achievements from his mathematical works, specially with respect to theory of partial actions: he is, indeed, considered the Father of Partial Actions.

Happy Birthday Ruy! - Feliz Aniversário!

Subject of the conference

Operator Algebras originated in the work of von Neumann, in his search for a mathematical framework for quantum mechanics, and of Gelfand and Naimark. They are the noncommutative versions of measure theory, topology and differential geometry and have deep ties with operator theory, ergodic theory, harmonic analysis, representation theory and quantum physics. In recent years the connections with other fields have guaranteed to Operator Algebras a central role in Mathematics, as it is seen from the work of A. Connes in noncommutative geometry and V. Jones in polynomial invariants. One of the many ramifications of these developments is the fruitful interaction with Dynamical Systems. The deep connections between Ergodic Theory and von Neumann algebras, established in the 70's by A. Connes, W. Krieger, J. Feldman, C. Moore and others, has recently found its counterpart in equally deep connections linking Topological Dynamics and C*-algebras. For example, for the class of symbolic dynamical systems there exists a correspondence with the theory of C*-algebras (through the notion of crossed products and their K-theory groups). For Markov shifts, for example, the corresponding C*-algebra is the well known Cuntz-Krieger algebra and its K0-group is the known invariant introduced by Bowen and Franks in 1977. The theory of operator algebras is undoubtedly one of the domains in Mathematics most notable for the depth of its problems, the richness of its new ideas, its connections to so many different fields, and its great potential as a unifying language and source of illumination.

Conference Venue

The workshop will take place in Canasvieiras, in the Hotel Palace Praia, with whom with have negotiated special room prices as follows:

- Single room - R$ 203,00.
- Double room - R$ 246,50.
- Triple room - R$ 323,00.
- Quadruple: R$ 395,00.

Every participant should book his/her own room.
To do it, please send an email to reservas@palacepraia.com.br, informing that your are a participant of the Satellite ICMOA 2018.


We ask everyone to register. To register please download this text file, fill it out using your favourite text editor, save it as text (please avoid unnecessarily complicated editor formats) and e-mail it as an attachment to icm2018oasatellite@gmail.com. Alternatively you may copy and paste it directly on your mail editor and send it to us as the body of your message. In this case a "plain text" message is preferred over "rich formatting". The registration deadline is July 15, 2018. It is important to provide your date and time of arrival in the registration form. We will try to organize transfers from the airport.

Registration fees

There will be a registration fee of R$ 250 (aproximately 80 USD), payable upon arrival.
Registration fees should be paid in Reals (the local currency), either in cash or Brazilian checks. We are not prepared to deal with credit cards, foreign checks or foreign currency.


Confirmed Speakers:

Alcides Buss (UFSC)
Alexander Kumjian (Nevada)
Andreas Thom (Dresden)
Artur Lopes (UFRGS)
Benjamin Steinberg (New York / CUNY)
Camila Sehnem (Göttingen)
Charles Starling (Carleton)
Christopher Phillips (Oregon)
Dana Williams (Dartmouth)
Danie van Wyk (UFSC)
David Pitts (Lincoln)
Elizabeth Gillaspy (Montana)
Enrique Pardo (Cadiz)
Fernando Abadie (Montivideo)
George Elliott (Toronto)
Gilles Gonçalves de Castro (UFSC)
Ian F. Putnam (Victoria)
Ilijas Farah (York)
Jean Renault (Orleans)
Joachim Cuntz (Münster)
Kang Li (Warsaw / INPAN)
Karen Strung (Warsaw)
Kristin Courtney (Virginia)
Lisa Orloff Clark (Wellington)
Marcelo Laca (Victoria)
Maria Nørgård-Solano (Copenhagen)
Marc Rieffel (Berkeley)
Mercedes Siles Molina (Malaga)
Misha Dokuchaev (USP - Sao Paulo)
Pere Ara (Barcelona)
Ralf Meyer (Göttingen)
Rufus Willett (Honolulu, Hawaii)
Sarah Browne (Penn State)
Sarah Reznikoff (Kansas State)
Siegfried Echterhoff (Münster)
Soren Eilers (Copenhagen)
Thierry Giordano (Ottawa)
Vaughan Jones (Berkeley, Vanderbilt)
Wilhelm Winter (Münster)
Vladimir Pestov (UFSC/Ottawa)
Xin Li (London)
Zhuang Niu (Wyωing)

Schedule of Talks

Book of Abstracts

Poster Session

We plan to organize a poster session in this conference. If you would like to contribute, please follow these instructions:

Instructions for submission of a poster

Registered participants

Additional Information

For more information, please send an email to icm2018oasatellite@gmail.com, or if you prefer, contact one of the

Local Organizers:


Alcides Buss (alcides.buss at ufsc dot br),
Daniel Gonçalves (daniel.goncalves at ufsc dot br),
Gilles Gonçalves de Castro (gilles.castro at ufsc dot br)
Giuliano Boava (g.boava at ufsc dot br)


Viviane Beuter (vivibeuter@gmail.com)

International Organizing Committee:

Thierry Giordano
Siegfried Echterhoff
Nathanial Brown

Scientific Committee:

Alcides Buss
Daniel Gonçalves
George Elliott
Joachim Cuntz
Marcelo Laca
Vaughan Jones


UFSC   uOttawa   WWU     WWU     WWU    

CAPES     FAPESC     NFS    


Practical Information


In order to check if you need a visa to enter Brazil, you may visit the Brazilian Consulate of your country.

Arriving in Florianópolis by plane

Even though Florianópolis is served by the "Hercilio Luz International Airport" (code FLN), very few international flights arrive directly in Florianópolis.
International passengers will most likely book a flight to Sao Paulo or Rio de Janeiro and then take a local connecting flight to Florianópolis.
The major airlines offering multiple daily flights from either Sao Paulo or Rio to Florianópolis are LATAM , and GOL .
Both Sao Paulo and Rio have more than one major airport. Please make sure your connecting flight leaves from the same airport your international flight arrives at.
Transferring between airports may be an unpleasant experience.

Once you have arrived at Florianópolis airport, the best way to reach Canasvieiras is by taxi, which takes approximately 40 minutes.
The taxi ride will cost approximately R$ 80.00.

More informations may be found here.
Drivers at this Coop accept most credit cards.
Should you anticipate any difficulty in your communication with the taxi driver, please be prepared to show him/her the following text:
"Por favor me leve ao 'Hotel Palace Praia'. Endereço: Praça República do Líbano, 40, Praia de Canasvieiras."

We are organizing transfers from the airport to the hotel for all registred participants (please keep in mind the 15th of July deadline). To offer this service we need you to fill your flight info in the registration form. Closer to the date we will send you the transfer contact info.

Exchanging currency

The currency in Brazil is called "Real" and it is denoted "R$". The uptated exchange rate can be seen here.
There is a currency exchange office at the main lobby of the airport in Florianópolis.
Merchants in Florianópolis are not used to accepting foreign currency. On the other hand credit cards are widely accepted throughout Brazil.


Winter temperature average in Florianópolis normaly ranges between 10-20 degrees (Celsius).
CNN weather page for Florianópolis

Future announcements

If you want to receive further information as it becomes available, please send us an e-mail at icm2018oasatellite@gmail.com.
You may also want to check this page regularly as we plan to keep all of the relevant information available here.

Looking forward to seeing you in Florianópolis in July 2018!