Antonio Bucciarelli and Delia Kesner visited UBA for a period of 2 weeks starting 5 May. They interacted with the local group on rewriting and lambda calculus (LoReL). Antonio gave a talk on “Definability and Full Abstraction Problems for Lambda Calculi”.Antonio Bucciarelli and Delia Kesner visited UBA for a period of 2 weeks starting 5 May. They interacted with the local group on rewriting and lambda calculus (LoReL). Antonio gave a talk on “Definability and Full Abstraction Problems for Lambda Calculi”.Antonio Bucciarelli and Delia Kesner visited UBA for a period of 2 weeks starting 5 May. They interacted with the local group on rewriting and lambda calculus (LoReL). Antonio gave a talk on “Definability and Full Abstraction Problems for Lambda Calculi”.