13 citations
4 papers
Actions of Galois groups on invariants of number fields
Aristides Kontogeorgis
In this paper we investigate the connection between relations among various invariants of number field s coresponding to subgroups acting on and of linear relations a…
Global existence in infinite lattices of nonlinear oscillators: The Discrete Klein-Gordon equation
Nikos I. Karachalios
Pointing out the difference between the Discrete Nonlinear Schrödinger equation with the classical power law nonlinearity-for which solutions exist globally, independently of the s…
On the Dynamics of a Degenerate Parabolic Equation: Global Bifurcation of Stationary States and Convergence
Nikos I. Karachalios, Nikos B. Zographopoulos
We study the dynamics of a degenerate parabolic equation with a variable, generally non-smooth diffusion coefficient, which may vanish at some points or be unbounded. We show the e…
Extension of Moyal-deformed hierarchies of soliton equations
Aristophanes Dimakis, Folkert Muller-Hoissen
Moyal-deformed hierarchies of soliton equations can be extended to larger hierarchies by including additional evolution equations with respect to the deformation parameters. A gene…