There is a long history in the social sciences of building models to describe processes related to arms races. These include both theoretical models, such as the actionreaction Richardson model, and empirical models. In addition, there is a substantial literature on estimating parameters associated with these models given observations of military expenditures, or various proxies. Such methods s...

In defense of the sprawling, low-density development which increasingly characterizes modern cities, Gordon and Richardson (1986, 1996) argue that the urban spatial structure generated by market forces reflects the will of the people. Planners, in contrast, typically have little faith in either the efficiency or equity of market-determined outcomes, and advocate detailed land use planning. To e...

We introduce a new class of combinatorial objects, which we call “bipieri tableaux,” which arise in a natural way from the evaluation of products consisting of commutative or noncommutative complete homogeneous symmetric functions and elementary symmetric functions through repeated applications of Pieri rules. We prove using sign-reversing involutions on bipieri tableaux an elegant coproduct fo...

Given a set 5 with an irreflexive relation >, define the operators dom and max as follows. For any subset T of S, dom T is the set of all x in 5 such that for some t\nT,t>x; max T= T — dom T. A solution of (S, >) is a subset T of 5 satisfying T = S — dom T. A solution of an w-person game in the sense of [3] is precisely a solution, as just defined, of a certain system (S, >) associated with the...

551 Roger Wolcott Richardson was born on 30␣ May 1930 in Baton Rouge, Louisiana. He was the eldest of the four sons of Roger Wolcott Richardson jr and Cora Johnson. His father was completing a Ph.D. in chemical engineering at the time of Richardson’s birth and subsequently devoted virtually his whole working life to a career as an executive with Standard Oil (later the Exxon Corporation). His y...

This paper introduces the theoretical development of a numerical method, named NeAREst, for solving nonnegative linear inverse problems, which arise often from physical or probabilistic models, especially, in image estimation with limited and indirect measurements. The Richardson-Lucy (RL) iteration is omnipresent in conventional methods that are based on probabilistic assumptions, arguments an...

INTRODUCTION On March 18, 2009, actress Natasha Richardson died after a head injury. It is possible that the rate of patients presenting with mild head injury and receiving computed tomographies (CTs) may have been influenced by the Richardson event. We hypothesized that there was a statistically significant increase in the rate of census-adjusted head CTs performed for mild trauma after March ...