### Math 334 A1: Introduction to Differential Equations (Fall 2010)

• NEW!! Office hours before final:
• Friday 12:30 -- 16:30;
• Tuesday 9:30 -- 14:00.
• NEW!! See where you are in the class after two midterms!
As double scheme is not allowed by the university, we will discard the 2nd scheme. More specifically, the weights are:
Homework 10%;    Midterm 1: 15%;     Midterm 2: 15%;    Final: 60%.
Anyone sees this announcement please inform your friends asap.

#### Course Calendar

 Instructor / Office / Phone # Xinwei Yu / 527 CAB / (780)4925731 Email / Webpage xinwei.yu@gmail.com / http://www.math.ualberta.ca/~xinweiyu Location / Time / Office Hours DP 6069 / MWF 12pm - 12:50pm / MWF 1pm-2pm or by appointment

Course Information
Important dates.
• Homeworks (temporary): Sep. 24, Oct. 8, Nov. 5, Nov. 26, Dec. 8. Note that the last one is on Wednesday.
• Midterms (temporary): Monday Oct. 18, 2010; Monday Nov. 15, 2010. Both in class.
• Final: Wednesday Dec. 15, 2010; 2pm-4pm; ESB 3 27.
• Deferred exam: Saturday Jan. 15, 2011;  9am-noon. CAB 357 (Requires approval from your Faculty Office).

#### Course Material

Required Problems
• Important: Drafts of lecture notes will be posted before the lectures. However please refrain from printing them as major revision may occur as they get lectured. The revised versions will be posted after the lectures.
 Topics Homeworks(Solutions) Lecture Notes Introduction Introduction (Updated) Solving 1st order ODEs Homework 1 (Solution, Statistics) Solving 1st order ODEs (Updated) Solving 2nd and higher order linear ODEs Homework 2 (Solution, Statistics) Solving 2nd order ODEs (Updated) Series solutions Homework 3 (Solution, Statistics) Series Solutions (Updated; The part on solving equations at singular points is totally re-written) Laplace transform method Homework 4 (Solution, Statistics) Method of Laplace Transform (Draft) 1st order systems Homework 5 (Solution, Statistics) First Order Systems (Updated)

#### Useful Stuff

• Encyclopedic Differential Equation Website: Equation World. (NEW!)
• Khan Academy: Differential equations;
• MIT Open Courses: Differential equations;
• Other online videos that you may find helpful:
• Other online resources:
• Wolfram Alpha: Play with it and get comfortable facing differential equations!

Need help to start? Type
• what is cosh(x) (then "enter" of course), or
• differentiate cosh(x), or
• solve y'' + y = 0, or
• ...