Photo 1: Friday before Memorial Day weekend, group work on proving the concavity property, after lunch under the sun at Sinbad. 

Photo 2: Thursday before ISMM, Pengcheng’s practice, helped by many comments/ questions/ suggestions from Michael, Sandya, Hao, and John and the presence of Ethan, Jie, Tianqin and Lizy. 

Photo 3: introduction by Hans-Boehm