Volume 11, Issue 4, November 2004
Pages: 422 - 432
We give a basic uniqueness theorem in the inverse spectral theory for a Sturm-Liouville
equation with a weight which is not of one sign. It is shown that the theorem may be
applied to the spectral problem associated with the Camassa-Holm integrable system
which models shallow water waves.
Pages: 435 - 460
Pages: 461 - 471
It is shown that in water of finite depth, there are no periodic traveling waves with the
property that the pressure in the underlying fluid flow is constant along streamlines.
In the case of infinite depth, there is only one such solution, which is due to Gerstner.
Pages: 472 - 479
We consider two-dimensional water-waves of permanent shape with a constant proagation speed. Two theorems concerning the uniqueness of certain solutions are rported. Uniqueness of Crapper's pure capillary waves is proved under a positivity
assumption. The proof is based on the theory of positive operators....
Pages: 480 - 498
The aim of this paper is to present aspects of the use of Lie groups in mechanics.
We start with the motion of the rigid body for which the main concepts are extracted.
In a second part, we extend the theory for an arbitrary Lie group and in a third section
we apply these methods for the diffeomorphism...
Pages: 499 - 507
We consider the direct/inverse spectral problem for the periodic Camassa-Holm eqution. In fact, we survey the direct/inverse spectral problem for the periodic weighted
operator Ly = m-1
4 y) acting in the space L2
(R, m(x)dx), where m = uxx-u >
0 is a 1-periodic positive function and u is...
Pages: 508 - 520
We show that the smooth traveling waves of the Camassa-Holm equation naturally
correspond to traveling waves of the Korteweg-de Vries equation.
Pages: 521 - 533
We survey recent results on well-posedness, blow-up phenomena, lifespan and global
existence for the Camassa-Holm equation. Results on weak solutions are also consiered.
Pages: 534 - 548
The goal of this survey article is to explain the up-to-date state of the theory of
Lp - Lq decay estimates for wave equations with time-dependent coefficients. We
explain the influence of oscillations in the coefficients by using a precise classification.
Moreover, we will see how mass and dissipation...
Pages: 549 - 555
We prove a uniqueness result for autonomous divergence-free systems of ODE's in the
plane and give an application to the study of water flows with vorticity.