Dear friends and colleagues, on Monday 3 April 2017 Ji Li (Macquarie University) is giving a talk in the PDE Seminar on "Commutators, factorizations and function spaces associated with operators" An abstract is available at http://www.maths.usyd.edu.au/u/PDESeminar/abstracts17/li.xhtml The talk is from 2 pm - 3 pm in Carslaw 829 (Access Grid Room) on the Camperdown Campus at the University of Sydney. Everybody is invited to attend the talk, take part in the discussion afterwards in Carslaw Common Room 727 on level 7, and to join us for lunch. Kind regards, Daniel D and Daniel H P.S: If you know suitable speakers or want to give a talk yourself, please let us know.