The search for higher homotopy Hopf algebras (known today as A∞-bialgebras) began in 1996 during a conference at Vassar College honoring Jim Stasheff in the year of his 60th birthday. In a talk entitled ”In Search of Higher Homotopy Hopf Algebras”, I indicated that a DG Hopf algebra could be thought of as some (unknown) higher homotopy structure with trivial higher order structure and deformed ...

In many avian species, vocal repertoire expands and changes throughout life as new syllables are added and sounds adapted to neighbours and circumstances. Referential signals, on the other hand, demand stability and lack of variation so that their meaning can be understood by conspecifics at all times. It is not known how stable such signals may be when the context is changed entirely but the p...

The Central Australian public health network became aware of 2 cases of Murray Valley encephalitis during February to March, 2001. Both cases were noted following reports of MVE virus activity in sentinel chicken flocks throughout the Kimberley and Pilbara regions of Western Australia, similar activity in western New South Wales and evidence of sequential north-south spread of virus activity in...

In ecological analysis, complexity has been regarded as an obstacle to overcome. Here we present a straightforward approach for addressing complexity in dynamic interconnected systems. We show that complexity, in the form of multiple interacting components, can actually be an asset for studying natural systems from temporal data. The central idea is that multidimensional time series enable syst...