Transcription of Partial Differential Equations
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Partial Differential Equations
Partial Differential EquationsLecture NotesErich MiersemannDepartment of MathematicsLeipzig UniversityVersion October, 20122 Contents1 Examples .. Equations from variational problems .. Ordinary differential Equations .. Partial differential Equations .. Exercises .. 222 Equations of first Linear Equations .. Quasilinear Equations .. A linearization method .. Initial value problem of Cauchy .. Nonlinear Equations in two variables .. Initial value problem of Cauchy .. Nonlinear Equations inRn.. Hamilton-Jacobi theory .. Exercises .. 593 Linear Equations of second order .. Normal form in two variables .. Quasilinear Equations of second order .. Quasilinear elliptic Equations .. Systems of first order .. Examples.
An equation is said to be linear if the unknown function and its deriva-tives are linear in F. For example, a(x,y)ux +b(x,y)uy +c(x,y)u = f(x,y), where the functions a, b, c and f are given, is a linear equation of first order. An equation is said to be quasilinear if it is linear in the highest deriva-tives. For example,
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