73 citations · 79 across the 4 of their papers we have counts for
4 papers
Operator pencils on the algebra of densities
A. Biggs, H. M. Khudaverdian
In this paper we continue to study equivariant pencil liftings and differential operators on the algebra of densities. We emphasize the role that the geometry of the extended manif…
The existence of a canonical lifting of even Poisson Structures to the Algebra of Densities
A. Biggs
In this note we construct a canonical lifting of arbitrary Poisson structures on a manifold to its algbera of densities. Using this construction we proceed to classify all extensio…
Operator pencil passing through a given operator
A. Biggs, H. M. Khudaverdian
Let be a linear differential operator acting on the space of densities of a given weight $\lo$ on a manifold . One can consider a pencil of operators $\hPi(Δ)=\{Δ_ł\}$ passi…
Extrinsic Radio Variability of JVAS/CLASS Gravitational Lenses
L. V. E. Koopmans, A. Biggs, R. D. Blandford +6
We present flux-ratio curves of the fold and cusp (i.e. close multiple) images of six JVAS/CLASS gravitational lens systems. The data were obtained over a period of 8.5 months in 2…