The Jubilee of Adolph Wagner

Overlapping Generations: The First Jubilee

Paul Samuelson’s (1958) overlapping generations model has turned 50. Seldom has so simple a model been so influential. Its “wow” factor, and the feeling of surprise at its originality and coolness have not paled with the years. The paper, in spite of its ripe age, still elicits wonder. Starting from the uncontroversial observation that “we live in a world where new generations are always coming...

The golden jubilee of vaccination against poliomyelitis.

Inactivated poliovirus vaccine (IPV), developed in the USA by Jonas Salk in the early 1950s, was field tested in 1954, and found to be safe and effective. The year 2004 marks the golden jubilee of this breakthrough. From 1955 IPV was used extensively in the US and polio incidence declined by more than 95 per cent. However, in 1962, when oral poliovirus vaccine (OPV) became available, the nation...

The Sabbath and Jubilee Cycle

he two-invasion hypothesis suffers from numerous defects. When pressed with the demand for proof, its advocates admit that real evidence is lacking. Rather, its premise is a matter of interpretation and possibilities. An examination of the reasoning process and the interpretations of evidence used to support this second invasion hypothesis reveals that it has little merit. What are presumed as ...

The Golden Jubilee Number of the Anticeptic

The Mermin-Wagner Theorem

LetA be a C∗ algebra such as the algebra of quasi-local observables of a quantum spin system on Z, and suppose {αt}t∈R is a strongly continuous one-parameter group of automorphisms of A, which we will refer to as the dynamics of the system. The examples we have in mind are the dynamics of a quantum spin system generated by a not-too-long-range interaction Φ, e.g., one that satsifies, for some λ...