Course Syllabus
This syllabus outlines the modules of Advanced Differential Equations.
- Initial value problems; Lipschitz condition; successive approximations; Picard-Lindelof theorem
- Peano existence theorem: statement; continuation of solutions; dependence on initial conditions and parameters
- maximal interval of existence; Gronwall inequality and applications; examples of non-uniqueness
- Systems of first-order differential equations; fundamental matrix; Wronskian for systems
- matrix exponential; homogeneous and non-homogeneous linear systems; variation of constants formula
- systems with constant coefficients; eigenvalue method
- Autonomous systems; phase plane analysis; critical points
- stability of linear systems; nonlinear systems and linearization
- Lyapunov stability: introduction; Lyapunov functions: elementary examples
- Two-point boundary value problems; self-adjoint differential operators
- Green's functions for boundary value problems; construction of Green's function in simple cases
- non-homogeneous boundary value problems; existence of solutions
- Regular Sturm-Liouville problems; eigenvalues and eigenfunctions; orthogonality of eigenfunctions; expansion in eigenfunctions
- Rayleigh quotient: introduction; singular Sturm-Liouville problems: idea
- applications to heat, wave and Laplace equations