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Analysis
The Cahn-Hilliard Equation with Dynamic Boundary Conditions
We study well-posedness and asymptotic behaviour of the
Cahn-Hilliard
equation with dynamic boundary condition. This modification of the
usual
non-flux condition has been introduced to incorporate surface
effects. By
means of optimal regularity results in the L_p-setting for the
linearized problem, well-posedness and the global semiflow in an
appropriate phase space are obtained. We also show convergence of
the
solutions to equilibrium states in energy norm. This result is
proved
via the recent Lojasiewicz technique.
Continuity of Countably Subadditive Seminorms
I shall present a result of Zabreiko regarding the
continuity of a countably subadditive seminorm on a Banach space
and show how several major theorems in functional analysis like
the
Uniform Boundedness Principle, Closed Graph Theorem, Open Mapping
Theorem etc. can be easily derived from this result.
On a family of weighted Hardy-Sobolev inequalities
We discuss some recent work on a family of weighted
Hardy-Sobolev inequalities due to Caffarelli-Kohn-Nirenberg
(1984),
including symmetry property and symmetry breaking of extremal
functions,
improved Hardy inequalities, as well as bound state solutions to
the associated nonlinear PDEs.
Regularity theory for general curvature flows
We will talk about curvature flows and their regularity theory.
The theorem is a DeGorgi type regularity but the monotonicity formula is lacking in our cases.
Inverse Scattering Theory for Wave Equations in Stratified Media (I)
This is a learning seminar on the Inverse Scatering theory.
Nonlinear Eigenvalue Problems in the Stability Analysis Morphogen Gradients
This talk is concerned with several eigenvalue problems from a linear stability analysis for the steady state morphogen gradients in Drosophila wing imaginal discs. These problems share several common difficulties including the followings: 1) The steady state solution which occurs in the coefficients of the relevant differential equations of the stability analysis is only know qualitatively and numerically. 2) Though the governing differential equations are linear, the eigenvalue parameter appears nonlinearly in the differential equations as well as in the boundary conditions.
Local and Global groups of automorphisms of CR manifolds.
The goal of the talk is to discuss some recent results
(obtained in
joint work with Bernhard Lamel) concerning the structure of the
local and
global groups of CR automorphisms of real-analytic CR manifolds,
whose
levi-form is allowed to degenerate. We will mainly focus on the
class of
real-analytic hypersurfaces containing no holomorphic curves and
show that in
such a setting the local automorphism groups can be analytically
parametrized
by a finite jet at any given point.
On the algebra of holomorphic functions
We discuss some old and new results on ideals,
characters, and finite matrices of the algebra of holomorphic functions on a pseudoconvex open set in Banach spaces with countable unconditional bases.