This is a short tribute to Dr. Seyed Ali Fakhr Tabatabaei celebrating his excellent and fruitfull career in neurosurgical practice and mentorship. 

Institutional punishment plays a central role in human societies. Yet research in evolutionary game theory has focused almost exclusively on peer punishment. Here we present a model for the evolution of institutional punishment. We consider a set of states (“kingdoms”), each consisting of a number of individuals (“subjects”) and a single leader (“king”). Subjects choose how much to pay to the k...

tal of Moldova, the Eastern province of Romania, into the family of a philosophy professor and a teacher. He was educated at the ‘B.P. Hasdeu’ College of Buzau, in Romania, where in 1930 he earned his bachelor’s degree, followed by graduating the School of Medicine of the University of Bucharest, Romania. His MD thesis had a rather unusual topic: the reconstitution of the nephron of the marine ...

P Biman Bagchi has made pivotal contributions to the area of dynamics of chemical and biological systems in an academic career spanning more than three decades. He has been a great teacher and mentor for a large number of young theoretical physical chemists of India and a creative and insightful collaborator with leading scientists worldwide. We take great pride in guest editing this special is...

titlan in the Valley of Mexico, that Aztec city was the capital of a far-flung tributary empire. The emperor Motecuhzoma sat atop a complex social and political hierarchy, and the Aztec populace owed allegiance and tribute to nobles at several levels. Below the emperor were the kings of subject city-states. The Aztec dominion employed a policy of indirect rule, and imperial authorities supporte...

A tribute for Tucker Childs

Vladimir Arnold, an eminent mathematician of our time, passed away on June 3, 2010, nine days before his seventy-third birthday. This article, along with one in the next issue of the Notices, touches on his outstanding personality and his great contribution to mathematics. A word about spelling: we use “Arnold”, as opposed to “Arnol’d”; the latter is closer to theRussian pronunciation, but Vlad...