Now showing items 1-6 of 6
Cohomology of Finite Groups
(University of Essen, 1992)
This is a short lecture course on the cohomology of finite groups. Topics include Künneth formula, cup products and cohomology ring, differential graded algebras, Evens norm map and the Steenrod operations.
Solving the Ginzburg-Landau equations by finite-element methods
(American Physical Society, 1992-10)
We consider finite-element methods for the approximation of solutions of the Ginzburg-Landau equations of superconductivity. The methods are based on a discretization of the Euler-Lagrange equations resulting from the ...
scattering and inverse scattering in one-dimensional nonhomogeneous media
(AIP Publishing, 1992-05)
The wave propagation in a one-dimensional nonhomogeneous medium is considered, where the wave speed and the restoring force depend on location. In the frequency domain this is equivalent to the Schrodinger equation d2-psi/dx2 ...
inverse scattering in 1-D nonhomogeneous media and recovery of the wave speed
(AIP Publishing, 1992-04)
The inverse scattering problem for the 1-D Schrodinger equation d2-psi/dx2 + k2-psi = k2P(x)psi + Q(x)psi is studied. This equation is equivalent to the 1-D wave equation with speed 1/ square-root 1 - P(x) in a nonhomogeneous ...
Cauchy-problem for the linearized version of the Generalized Polynomial KdV equation
(AIP Publishing, 1992-06)
In the present paper results about the "Generalized Polynomial Korteweg-de Vries equation" (GPKdV) are obtained, extending the ones by Sachs [SIAM J. Math. Anal. 14, 674 (1983)] for the Korteweg-de Vries (KdV) equation. ...
Commutative rings with homomorphic power functions
A (commutative) ring R (with identity) is called m-linear (for an integer m≥2) if (a+b)m=am+bm for all a and b in R. The m-linear reduced rings are characterized, with special attention to the finite case. A structure ...