Definability and decidability problems in number theory September 9 to September 13, 2013 American Institute of Mathematics, Palo Alto, CA Organizers: Thomas Scanlon, Alexandra Shlapentokh, Xavier Vidaux, and Carlos Videla Description: This workshop, sponsored by AIM and the NSF, will be devoted to studying definability and decidability questions in number theory, more specifically over rational numbers and their algebraic extensions, as well as over rings of functions of natural interest. Deadline: May 9, 2013 Details: http://www.aimath.org/ARCC/workshops/definabilityinnt.html