APMA 0360

Welcome to APMA 0360 – partial differential equations, but a whole lot of fun! On this website, you can find the syllabus, lecture notes, homework assignments, and study materials.


Syllabus

APMA 0360 – Syllabus (Spring 2025)

Homework Extension Request Form 


Lecture Notes

Note: The lecture notes will be frequently updated. Please refresh your webpage so that you have the most up-to-date version of the notes

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Date
Lecture Title
YouTube Videos
1 Jan 22 What is a PDE? Partial Derivatives
What is a PDE?
What is a solution?
2 Jan 24 Classification of PDE Simple PDE
Classification of PDE
Linear PDE
Second-Order Types
3 Jan 27 First-Order Linear PDE Directional Derivatives
Constant-Coefficient PDE
Variable-Coefficient PDE
First-Order Example
4 Jan 29 Transport Equation The Chain Rule
Coordinate Method
Transport Equation Derivation
Transport Equation Solution
Coordinate Method (practice)
Transport Equation Demo (demo)
5 Jan 31 Wave Equation Derivation Wave Equation Intro
Wave Equation Derivation
6 Feb 3 Wave Equation Solution Undetermined Coefficients Review
Wave Equation Solution
Wave Coordinate Method
Wave Equation Demo (demo)
7-8 Feb 5-7 D’Alembert’s Formula D’Alembert’s Formula 
D’Alembert Interpretation
Oscillating Wave
The Plucked String
Oscillating Wave (demo)
The Plucked String (demo)
9 Feb 10 Heat Equation Derivation Heat Equation Intro
Heat Equation Derivation
Behavior of Solutions
Heat Equation (demo)
Heat Equation Visual (demo)
10  Feb 12 Fourier Transform Gaussian Integral
Fourier Transform
Fourier Transform Example
Schwartz Class (optional)
exp(kt) (demo)
Fourier Transform (demo)
11 Feb 14 Fourier and Heat PDE (I) Fourier Transform Miracle
Laplace and ODE
Solving the Heat Equation
Convolution
Convolution Intuition (optional)
Convolution (demo)
12 Feb 19 Fourier and Heat PDE (II) Solving the Heat Equation
Heat Kernel 
Heat Kernel (demo)
Heat Equation Example
13 Feb 21 Inverse Fourier Transform Inverse Fourier Transform
Inverse Fourier and PDE
Shifting Property
14 Feb 24 Heat Equation Properties Heat Equation Properties
15 Feb 26 Energy Methods (I) Energy Method (Wave)
Application: Uniqueness
16 Feb 28 Energy Methods (II) Energy Method (Heat)
Summary: Heat vs Wave Heat vs Wave
17 Mar 3 Midterm 1 – Review First-Order PDE
Coordinate Method
Fourier Transform
Transform Method
Factoring Method
Mar 5 Midterm 1
18 Mar 7 Separation of Variables (I) Boundary-Value Problems
Separation of Variables
Easier Problem
Separation of Variables (demo)
Separation of Variables (demo) 
19 Mar 10 Separation of Variables (II) Separation of Variables Wave
Inhomogeneous Problem
Easier Problem Wave (practice)
20 Mar 12 Fourier Sine Series Orthogonality
Fourier Sine Series
Sine Series Example
Fourier series (demo)
Heat equation (demo)
21 Mar 14 Fourier Cosine Series Fourier Cosine Series
Cosine Series Example
Full Fourier Series
22 Mar 17 Complex Fourier Series Complex Fourier Series
Complex Fourier Example
Convergence of Fourier Series
23 Mar 19 Parseval’s Formula Parseval’s Formula
Sum of 1/m²
Sum of 1/m^4
Sum of 1/(m²+1)
24 Mar 21 Laplace Equation Laplace Equation Intro
Laplace Applications
OMG Application
25 Mar 31 Separation of Variables (III) Separation of Variables Laplace
Variation
26 Apr 2 Rotation Invariance Rotation Invariance
Polar Laplace (watch until 15:00)
27 Apr 4 Fundamental Solution Fundamental Solution
28 Apr 7 Laplace Properties Mean-Value Formula
Maximum Principle
Laplace Uniqueness
Positivity
Maximum Principle Heat (NEW)
29 Apr 9 Method of Characteristics Method of Characteristics
Characteristics Example
30 Apr 11 Ecology Application Ecology Application (NEW)
31 Apr 14 Midterm 2 – Review Separation of Variables
Parseval
Energy Method Laplace
Apr 16 Midterm 2
32 Apr 18 Epidemiology: COVID Model COVID Model (NEW)
Rescaling Time (NEW)
Traveling Waves (NEW)
33 Apr 21 Wealth and Income Distributions
34 Apr 23 The PDE that got me the PhD
35 Apr 25 Final Exam – Review
Never Fluid Flow Application (optional) Vector Calculus Review (NEW)
Incompressible Fluid (NEW)
Navier-Stokes Derivation (NEW)
Never Calculus of Variations (optional) Calculus of Variations
May 13 Final Exam

 


Assignments

Homework
Due Date
Solutions
Videos
Homework 1 Jan 31 Solutions
Homework 2 Feb 7 Solutions Transform Method
Homework 3 Feb 14 Solutions Factoring Method
Homework 4 Feb 21 Solutions
Homework 5 Feb 28 Solutions
Homework 6 Mar 14 Solutions Energy Method
Homework 7 Mar 21 Solutions
Homework 8 Apr 4 Solutions
Homework 9 Apr 11 Solutions Sum 1/(2m+1)^2
Sum 1/m^6
Homework 10 Apr 25
Homework 11 May 2 Optional
Mini Project May 2

YouTube Playlists

Chapter Playlist
1 Introduction
2 First-Order PDE
3 Wave Equation
4 Heat Equation
5 Energy Methods
6 Fourier Series
7 Laplace Equation
8 Applications

Exams

Midterm 1: Wednesday, March 5, 12-12:50 pm covers Lec 1-13

Practice Exam Solutions Comments
Study Guide
Mock Midterm 1 Solutions
Mock Midterm 2 Solutions
Mock Midterm 3 Solutions Spring 2023 Midterm 1
Mock Midterm 4 Solutions Fall 2024 Midterm 1
Midterm 1 Solutions Spring 2025 Midterm 1
Midterm 1 – Review

Midterm 2: Wednesday, April 16, 12-12:50 pm, covers Lec 14-25

Practice Exam Solutions Comments
Study Guide Updated
Mock Midterm 1 Solutions Only do 1, 6, 7
Mock Midterm 2 Solutions Ignore 3, 4, 8
Mock Midterm 3 Solutions Only do 4
Mock Midterm 4 Solutions Spring 2023 Midterm 2
Mock Midterm 5 Solutions Fall 2024 Midterm 2
Midterm 2 Solutions Spring 2025 Midterm 2
Midterm 2 – Review
PDE Handout
Peyam 1 Solutions Only do 5, 7, Bonus
Peyam 2 Solutions Only do 4, 5a
Peyam 3 Solutions Only do 6
Peyam 4 Solutions
Canez Solutions Only do 16-20
Nadler Solutions Only 6, 7
Vojta 1 Solutions Only do 9a, 10
Vojta 2 Solutions Only do 12, 13
Ribet 1 Solutions Only do 5, 9
Ribet 2 Solutions Only do 5, 6
Holtz Solutions Only do 8, 9
Tarr Solutions Only do 1e, 5, 6
Poonen Solutions Only do 18, 20
Lenstra Solutions Only do 4c, 5
Bergman Solutions Only do 3ab, 6

Final Exam: Tuesday, May 13, 9 am to 12 pm, covers the entire course

Note: Please also check out the practice midterms above for more study material

Practice Exam Solutions Comments
Study Guide
Mock Final 1 Solutions Ignore 7
Mock Final 2 Solutions Ignore 3, 4
Mock Final 3 Solutions Ignore 4, 8
Mock Final 4 Solutions Spring 2023 Final, ignore 7
Final Exam – Review

 


Calendar