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# Differential Equations (Leader: Prof. Wen-Xiu Ma <mawx (at) usf.edu>document.write('<a href="mai' + 'lto:' + 'mawx' + '&#64;' + 'usf.edu' + '">Prof. Wen-Xiu Ma</a>');)

## Tuesday, March 10, 2020

Title

Speaker
Time
Place

Inverse scattering for a nonlocal reverse-time six-component AKNS system of fourth-order and its exact solutions
12:30pm–1:45pm
CMC 108

Abstract

In this talk, I am going to talk about solvability of an integrable nonlocal reverse-time six-component AKNS system of fourth-order obtained from a reduced coupled system in the reverse-time AKNS hierarchy. An inverse scattering transform based on the Riemann-Hilbert problems will be formulated in order to derive exact solutions associated with a specific jump identity matrix.

## Tuesday, March 3, 2020

Title
Speaker
Time
Place

Binary Darboux transformation for nonlocal integrable equations
Wen-Xiu Ma
12:30pm–1:45pm
CMC 108

Abstract

We will talk about the Darboux transformation in soliton theory. A binary Darboux transformation is formulated for nonlocal integrable equations through eigenfunctions and adjoint eigenfunctions, and its general $$N$$-fold decomposition is shown explicitly. An application with zero potentials generates soliton solutions, and illustrative examples are about nonlocal integrable nonlinear Schrödinger equations.

## Tuesday, February 25, 2020

Title
Speaker

Time
Place

From the inverse scattering transform to the Darboux transformation
Yehui Huang
North China Electric Power University
China
12:30pm–1:45pm
CMC 108

Abstract

There are various methods for solving integrable systems. Starting from matrix spectral problems, the Darboux transformation can be applied to construction of solutions of nonlinear equations. The aim of the talk is to discuss applications of the Darboux transformation and its relation with the inverse scattering transform.

## Tuesday, February 18, 2020

Title
Speaker

Time
Place

Inverse scattering transform for the focusing nonlinear Schrödinger equation with nonzero background
Yong Zhang
Shandong University of Science and Technology
China
12:30pm–1:45pm
CMC 108

Abstract

We will discuss about a modified variant of the standard inverse scattering transform for the focusing nonlinear Schrödinger equation formulated in the presence of a nonzero background field. The aim of the talk is to solve Riemann-Hilbert problems with arbitrary-order poles and potentially severe spectral singularities in a beautifully simple and unified way.

## Tuesday, February 11, 2020

Title

Speaker
Time
Place

$$L^2$$-Sobolev space correspondence from jump matrices to potentials in the ZS-AKNS spectral problem, Part II
Fudong Wang
12:30pm–1:45pm
CMC 108

## Tuesday, February 4, 2020

Title
Speaker

Time
Place

$$L^2$$-Sobolev space correspondence from jump matrices to potentials in the ZS-AKNS spectral problem
Yehui Huang
North China Electric Power University
China
12:30pm–1:45pm
CMC 108

Abstract

Following the forward scattering theory, this week we will discuss about the inverse scattering theory for the ZS-AKNS spectral problem. More specifically, we will talk about the correspondence from jump matrices to potentials, and related decay and regularity properties.

## Tuesday, January 28, 2020

Title
Speaker
Time
Place

$$L^2$$-Sobolev space bijectivity in the inverse scattering theory for the ZS-AKNS system, Part II
Fudong Wang
12:30pm–1:45pm
CMC 108

## Tuesday, January 21, 2020

Title
Speaker
Time
Place

$$L^2$$-Sobolev space bijectivity in the inverse scattering theory for the ZS-AKNS system
Fudong Wang
12:30pm–1:45pm
CMC 108

Abstract

In this seminar talk, we will discuss the $$L^2$$-Sobolev space bijectivity of the scattering and inverse scattering transforms associated with the ZS-AKNS system, presented by Xin Zhou in 1998. The theory is a natural counterpart to the $$L^2$$-Fourier theory. The main result is to establish the relations of integral decay and regularity orders between the potential and the reflection coefficients. The proof is primarily based on a few of Riemann-Hilbert factorization problems. The basic $$L^1$$-theory of the inverse scattering transforms for general first-order spectral problems, by Beals and Coifman in 1984, offers a main framework for the analysis of the inverse scattering transforms in $$L^2$$.