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Approximation, deformation, quasification


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8th May 2017 to 12th May 2017
Pierre-Emmanuel Caprace
David Fisher
Henry Wilton

Workshop Theme

Studying how a mathematical object or theory is affected by small perturbations is a standard and usually useful technique to improve our understanding thereof. The goal of this workshop is to provide an overview of the current trends and future challenges related to that technique in the context of geometric group theory. A special emphasis will be put on the following topics and on their interrelations: appoximate groups, hyperlinear groups, metric approximations, quasi-isometries, quasi-morphisms, quasi-cocycles, representation varieties, rigidity, sofic groups, Ulam stability.

Deadline for applications: 05 February 2017

Apply now

Please note that there is a limited amount of external funding for young participants to cover the registration fee for this workshop, which will be allocated at the Workshop Organisers’ discretion.

Please note members of Cambridge University are welcome to turn up and sign in as a non-registered attendee on the day(s) during the workshop and attend the lecture(s). Please note that we cannot provide you with any support including name badge, meals or accommodation.

In addition to visiting the INI, there are multiple ways in which you can participate remotely.



Registration Only
  • Registration Package: £227
  • Student Registration Package: £177

The Registration Package includes admission to all seminars, lunches and refreshments on the days that lectures take place (Monday - Friday), wine reception and formal dinner, but does not include other meals or accommodation.

Formal Dinner Only
  • Formal Dinner: £50

Participants on the Registration Package, including organisers and speakers, are automatically included in this event. For all remaining participants who would like to attend the above charge will apply.


Unfortunately we do not have any accommodation to offer so all successful applicants will need to source their own accommodation. Please see the Hotels Combined website for a list of local hotels and guesthouses.



Lunch will be served at Wolfson Court in the Cafeteria from 12:30 to 13:30 on days that lectures take place.

  • Accommodation Package and Registration Package participants should present their badge as payment for their meal
  • Those issued with a blue Institute door entrance card can add money onto the card via the Porters' Lodge at Wolfson Court
  • Other participants must purchase their meal using their dining card via the Porters' Lodge (forms can be found on the registration desk or at the Porters' Lodge)

Evening Meal

Participants are free to make their own arrangements for dinner.

Formal Dinner

The Formal Dinner will take place on 10 May 2017 at Trinity College, Old Kitchen. Participants on the Registration Package, including organisers and speakers, are automatically included in this event.


Supported by:

University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons