41 research outputs found
Bochner transforms, perturbations and amoebae of holomorphic almost periodic mappings in tube domains
We give an alternative representation of the closure of the Bochner transform
of a holomorphic almost periodic mapping in a tube domain. For such mappings we
introduce a new notion of amoeba and we show that, for mappings which are
regular in the sense of Ronkin, this new notion agrees with Favorov's one. We
prove that the amoeba complement of a regular holomorphic almost periodic
mapping, defined on Cn and taking its values in Cm+1, is a Henriques m-convex
subset of Rn. Finally, we compare some different notions of regularity
Euler configurations and quasi-polynomial systems
In the Newtonian 3-body problem, for any choice of the three masses, there
are exactly three Euler configurations (also known as the three Euler points).
In Helmholtz' problem of 3 point vortices in the plane, there are at most three
collinear relative equilibria. The "at most three" part is common to both
statements, but the respective arguments for it are usually so different that
one could think of a casual coincidence. By proving a statement on a
quasi-polynomial system, we show that the "at most three" holds in a general
context which includes both cases. We indicate some hard conjectures about the
configurations of relative equilibrium and suggest they could be attacked
within the quasi-polynomial framework.Comment: 21 pages, 6 figure