Extremely amenable groups via continuous logic
  We establish a characterization of extreme amenability of any Polish group in Fra\"iss\'e-theoretic terms in the setting of continuous logic, mirroring a theorem due to Kechris, Pestov and Todorcevic for closed subgroups of the permutation group of an infinite countable set. 
Julien Melleray and Todor Tsankov
math.LO