FSF3623 HT24 Methods in Elliptic and Parabolic PDE (51290)

Welcome to the course!

Part I, Viscosity solutions to nonlinear PDEs.

This part treats modern theory of PDE, with geometric methods.                                                            

Literature: L.A. Caffarelli and X. Cabre: Fully Nonlinear Elliptic Equations. You may also find other related books/literature on the web.

Topics: Tangent paraboloids and second order differentiability, Viscosity solutions of elliptic equations; Examples, Alexandroff estimate and maximum principle, Harnack Inequality, Uniqueness of solutions, Concave equations, Dirichlet problem. 

Part II, Free boundary problems and Applications

I will mostly follow my book, and notes, that I will share with you. https://bookstore.ams.org/gsm-136 Links to an external site.

 

Place: Lectures take place at room 3418, at Math building, Tuesdays 13:15--15:00.

Examination: HW & presentation of a topic. For your presentation, maybe it is time to decide what you want to do. I am thinking of 25 min approx (powerpoint or on the blackboard, your choice). No need to write a report, just a topic of interest to the course. You may also choose parts in Cab-Caff book or from my notes, and depend more into that. We aim for first/second week of December.

 

 Lecture Notes:      Download HW Upload Solutions to HW
Crash-Course in Analysis methods in PDE Download Crash-Course in Analysis methods in PDE
Fully Nonlinear Notes 1 Download Fully Nonlinear Notes 1 HW1 Download HW1 HW1
Fully Nonlinear Notes 2 Download Fully Nonlinear Notes 2 HW2 Download HW2 HW2
Fully Nonlinear Notes 3 Download Fully Nonlinear Notes 3 HW3 Download HW3 HW3
Fully Nonlinear Notes 4 Download Fully Nonlinear Notes 4

Free Boundary Notes 1 Download Free Boundary Notes 1

Free Boundary Notes 2 Download Free Boundary Notes 2

Includes several weeks notes and might be updated.

HW for FB

HW1 Download HW1 (Due Nov. 4)

HW2:(Due Nov 24) Download HW2:(Due Nov 24)

Upload for

HW1

HW2

 

Examples of projects: around 20--25 min.

In each topic you may present the problem, general idess, and heuristics with at least one proof of some part of the argument.

 

 

PDE:

1) Viscosity solutions for fully nonlinear parabolic problems

2) Boundary Harnack Principle

3) Existence theory: Variational Approach

4) Existence theory Perron’s supersol method

5) C^1,a regularity of viscosity solutions

6) Proofs of Morrey Type estimates

FBP:

1) ACF monotonicity formula and its applications

2) Whitney’s extension theorem and its application in FB regularity

3) Discuss the classification of global solutions for obstacle problem 

4) Epiperimetric inequality (what is it and how is it used)

5) Bernoulli type FBP,

 

You may also choose a topic closer to your taste, and we can discuss it.