S ir Richard Doll falleció en Oxford a la edad de 92 años el 24 de Julio de 2005 a causa de un fallo cardiaco agudo. Había pasado por varias jubilaciones: de la presidencia de Regius Professor of Medicine en 1979; de Green College, el cual fundó y donde cinco años fue director; y de la Universidad de Oxford en 1983. Tras 22 años de su última jubilación “oficial”, aún se complacía en escribir ar...

There have recently been moves afoot among evolutionary biologists to stop speaking of ‘Darwin’s theory of evolution’ and, instead, to call it ‘Darwin’s law of evolution’. This is to stymie creationists who like to say ‘evolution is only a theory’. Now I am all in favour of stymieing creationists, but I think that this idea is misguided. The underlying assumption is that the use of the word ‘La...

1971 The purpose of this paper is to exhibit a theory of integration which can be used on a large class of topological spaces and which generalizes the theory of integration over the locally compact Hausdorff spaces. The first part of the paper is devoted to the construction of such a theory. An integral is viewed as a positive linear functional having a certain extension property on a particul...

In this paper we introduce a class of partially ordered sets, called differential posets, with many remarkable combinatorial and algebraic properties. (Terminology from lattice theory and the theory of partially ordered sets not explained here may be found in [St6].) The combinatorial properties of differential posets are concerned with the counting of saturated chains Xl < x2 < ... < x k or of...