I was recently informed by the American Association for the Study of Liver Diseases about the loss of Paul Angulo. It was very surprising for me that such a young, enthusiastic and productive hepatologist has passed away and I want to take the opportunity to write about my friend and colleague Paul Angulo. He was born in Guasabe, Sinaloa, Mexico. He did his college at “Eng. Pascual Ortiz-Rubio”...

The last time I saw Paul Erdős was in May 1995, during the Conference on Analytic Theory held in Urbana, Ill. in honour of H. Halberstam. It was a beautiful spring day, and we were walking (slowly, as Erdős had some trouble with his foot) in the park of Allerton Conference Center, where the meeting took place. At one point Erdős turned to me and said: ”You know, it is said that that those who p...

We develop elements of a theory of cooperation and coordination in networks. Rather than considering a communication network as a means of distributing information, or of reconstructing random processes at remote nodes, we ask what dependence can be established among the nodes given the communication constraints. Specifically, in a network with communication rates between the nodes, we ask what...

On October 18, 1996, hundreds of people, including many mathematicians, gathered at Kerepesi Cemetery in Budapest to pay their last respects to Paul Erdős. If there was one theme suggested by the farewell orations, it was that the world of mathematics had lost a legend, one of its great representatives. On October 21, 1996, in accordance with his last wishes, Paul Erdős’ ashes were buried in hi...