Matthew L. Wright
Assistant Professor, St. Olaf College

Partial Differential Equations

Math 330 ⋅ Fall 2018

Prof. Wright's office hours: Mon. 1–2, Tues. 10–11, Wed. 2–3, Thurs 10–11, Fri. 1–2, whenever the door is open, or by appointment in RMS 405

Help sessions: Tuesdays 7–8pm in Tomson 186

Jump to today
Thursday
Sep. 6
Introduction
ODE review
Do the following before next class:
Tuesday
Sep. 11
Heat equation
Do the following before next class:
  • Read §1.3 and §1.4. Note three possible boundary conditions discussed in §1.3. Then note how the heat equation, with certain boundary conditions, can be solved for equilibrium solutions in §1.4.
  • Finish Homework 1 (due 4pm Thursday). You may want to use the LaTeX template on Overleaf.
Thursday
Sep. 13
Heat equation
Homework 1
due today
Do the following before next class:
Tuesday
Sep. 18
Multidimensional heat equation
Do the following before next class:
  • Read §2.1 and §2.2. Note the definition of a linear operator and the principle of superposition.
  • Finish Homework 2 (due 4pm Thursday).
Thursday
Sep. 20
Separation of variables
Homework 2
due today
Do the following before next class:
  • Read §2.3. This is a long section, but the the first half (or so) should be somewhat familiar from class. Answer the reading questions (TeX source), and bring your answer to class on Tuesday.
  • Begin Homework 3.
Tuesday
Sep. 25
Separation of variables, continued
Do the following before next class:
  • Read the §2.3 Appendix (pages 54–55). Also read §2.4, and make sure you understand the two examples in this section.
  • Finish Homework 3 (due 4pm Thursday).
Thursday
Sep. 27
Orthogonality and initial conditions
Time-dependent solutions to the heat equation
Homework 3
due today
Do the following before next class:
  • Re-read §2.4. Note how orthogonality of sine and cosine functions is used to find the coefficients of the series solutions in this section.
  • Read §2.5.1 and §2.5.2. Answer the reading questions (TeX source), and bring your answer to class on Tuesday.
  • Begin Homework 4.
Tuesday
Oct. 2
Laplace's equation and separation of variables
Do the following before next class:
  • Read §3.1 and §3.2. Note the convergence theorem for Fourier series.
  • Finish Homework 4 (due 4pm Thursday).
Thursday
Oct. 4
Fourier series
Take-home exam assigned
Homework 4
due today
Do the following before next class:
Tuesday
Oct. 9
Fourier series
Take-home exam
due today
Do the following before next class:
  • Read §3.3. Pay close attention to the definitions, examples, and convergence properties of Fourier sine and cosine series.
  • Read §3.4. Note the conditions under which a Fourier (cosine/sine) series can be differentiated term by term.
  • Take a look at Homework 5.
Thursday
Oct. 11
Differentiation of Fourier series
Fall break! No class Tuesday, October 16.
Do the following before next class:
  • Re-read §3.4. Make sure you understand the conditions under which a Fourier (cosine/sine) series can be differentiated term by term. Also note the method of eigenfunction expansion.
  • Read §3.5 (it's short!). Note what happens when you integrate Fourier series.
  • Finish Homework 5.
Thursday
Oct. 18
Eigenfunction expansion
Homework 5
due today
Do the following before next class:
Tuesday
Oct. 23
Eigenfunction expansion
Wave equation
Do the following before next class:
Thursday
Oct. 25
Wave equation
Homework 6
due today
Do the following before next class:

For two extra-credit points, attend one of these two talks by Minah Oh on Monday or Tuesday, and complete these two questions on Moodle.

Tuesday
Oct. 30
Finish D'Alembert's solution to the wave equation
Intro to Sturm-Liouville problems
Do the following before next class:
Thursday
Nov. 1
Sturm-Liouville problems
Homework 7
due today
Do the following before next class:
  • Read §5.4 and §5.5. To better understand connections between differential equations and linear algebra, read the Appendix to 5.5.
  • Continue thinking about what you might want to work on for the Final Project.
  • Begin Homework 8.
Tuesday
Nov. 6
Sturm-Liouville problems
Operators, orthogonality, and self-adjointness
Do the following before next class:
  • Re-read §5.5. Note the role of Lagrange's identity and Green's formula in the proofs presented in this section.
  • Read §5.6. Observe how the Rayleigh quotient can provide a bound on the lowest eigenvalue.
  • Finish Homework 8 (due 4pm Thursday).
  • Continue thinking about what you might want to work on for the Final Project.
Thursday
Nov. 8
Sturm-Liouville problems
Rayleigh quotient and eigenvalue bounds
Homework 8
due today
Do the following before next class:
  • Read §5.7. This example should look familiar now!
  • Read §6.1 and §6.2. Observe how Taylor series can be used to approximate the value of a derivative of a function using values of the function at nearby points.
  • Complete the Final Project Planning Survey on Moodle. See also the Final Project Information.
  • Begin Homework 9.
Tuesday
Nov. 13
Finite difference methods
Do the following before next class:
  • Re-read §6.2. Note how the finite difference approximations can be applied to second derivatives.
  • Read §6.3.1–§6.3.3. Observe how finite difference approximations for derivatives can be used to approximate solutions to the heat equation.
  • Finish Homework 9 (due 4pm Thursday).
Thursday
Nov. 15
Finite difference methods
Take-home exam assigned
Homework 9
due today
Complete the take-home exam before next class.

For two extra-credit points, attend the Research Seminar by Jasper Weinburd (Nov. 16, 3:40pm, RNS 204), and complete these two questions on Moodle.

Tuesday
Nov. 20
Finite difference methods
Take-home exam
due today
Thanksgiving break! No class Thursday, Nov. 22
Do the following before next class:
Tuesday
Nov. 27
Guest presentation
Do the following before next class:
Thursday
Nov. 29
To be determined
Homework 10
due today
Work on your project.
Tuesday
Dec. 4
Work on projects
Work on your project.
Thursday
Dec. 6
Work on projects
Work on your project.
Tuesday
Dec. 11
Work on projects
Finish your project.
Wednesday
Dec. 19
Project presentations
2:00 – 4:00pm