First order quasilinear equations with boundary conditions

Math 220: First Order Scalar Quasilinear Equations

(1) a(x, y, u)ux + b(x, y, u)uy = c(x, y, u), with a, b, c at least C, given real valued functions. There is an immediate difference between semilinear and quasilinear equations at this point: since a and b depend on u, we cannot associate a vector field on R to the equation: we need to work on R at least to account for the (x, y, u) dependence. To achieve this, we proceed as follows. We consid...

Exact boundary controllability and observability for first order quasilinear hyperbolic systems with a kind of nonlocal boundary conditions

In this paper we establish the theory on semiglobal classical solution to first order quasilinear hyperbolic systems with a kind of nonlocal boundary conditions, and based on this, the corresponding exact boundary controllability and observability are obtained by a constructive method. Moreover, with the linearized Saint-Venant system and the 1D linear wave equation as examples, we show that th...

boundary layer problem for system of first order of ordinary differential equations with linear non-local boundary conditions

in this paper we study the boundary layer problems in which boundary conditions are non-local. here we try to find the necessary conditions by the help of fundamental solution to the given adjoint equation. by getting help from these conditions, at first the boundary condition is changed from non-local to local. the main aim of this paper is to identify the location of the boundary layer. in ot...

Fractional-order Legendre wavelets and their applications for solving fractional-order differential equations with initial/boundary conditions

In this manuscript a new method is introduced for solving fractional differential equations. The fractional derivative is described in the Caputo sense. The main idea is to use fractional-order Legendre wavelets and operational matrix of fractional-order integration. First the fractional-order Legendre wavelets (FLWs) are presented. Then a family of piecewise functions is proposed, based on whi...

Existence Theorem for First Order Ordinary Functional Differential Equations with Periodic Boundary Conditions