Math 441 (C13) -- Differential Equations -- Fall, 2008 Prof. C. Ward Henson

• This is a detailed description of what was done in each class; there is a separate listing of the homework that was assigned.  These files will be revised as soon as possible after each class to keep them up to date.
• Come to class ready to discuss any examples or problems that you were not sure of.
• References are to the textbook for this class, Elementary Differential Equations (8th edition) by Boyce and DiPrima.
• During the semester we will cover the following material from this text (but not always in the same order as it is presented in the book): chapters 2 (omit 2.7, 2.9), 3 (omit 3.8, 3.9), 4, and 5, as well as sections 7.1, 7.5, and 9.1 (for 2x2 systems only).
• Classes are described in reverse time order.

Final Exam: 8-11am Fri. 12/19 in 141 Altgeld.

Problem session for the final exam: 5:00 Thurs. 12/18 in 141 Altgeld.

Special office hours before the final exam: Tues. 12/16 at 4:30; Wed. 12/17 at 11:30; and Thurs. 12/18 at 11:30.

Classes 42 and 42 (M 12/8 and W 12/10): in section 9.1, cover pages 484-488 (Cases 1,2,3); omit Case 4 (complex eigenvalues).  See also pages 422-426 in 7.8 (repeated eigenvalues).

Class 41 (F 12/5): Exam #3 on Chapter 5 plus 7.1 and 7.5.

Thursday, 12/4: problem session for Exam #3; 5:30pm in room 145 Altgeld.

Class 40 (W 12/3): finish 7.5.

Class 39 (M 12/1): finish covering 7.1 and begin 7.5.

Class 38 (F 11/21): begin covering 7.1.

Quiz #10 on F 11/21 covers 5.4, 5.5, 5.6, and 5.7.

Class 37 (W 11/19): cover 5.8.

Classes 35 and 36 (F 11/14 and M 11/17): cover 5.6 and 5.7.

No homework grading in the week of M 11/17: the TA is away.

Quiz #9 on F 10/14 covers 5.2 and 5.3.

Class 34 (W 10/12): cover 5.4

Classes 31, 32, and 33 (W 11/5, F 11/7, and M 11/10): cover sections 5.2 and 5.3.

Quiz #8 on F 11/7 covers 5.1 and the Taylor Series handout.

Class 30 (M 11/3): cover 5.1 and background on Taylor series.

Class 29 (F 10/31): Exam #2 on Chapters 3 and 4, plus Euler equations (exercise 23 in section 5.5).

Thursday, 10/30: problem session for Exam #2; 5:00pm in room 145 Altgeld.

Class 28 (W 10/29): finish discussion of Chapters 3 and 4.

Class 27 (M 10/27): cover 3.7 and 4.4.

Class 26 (F 10/24): cover 3.6 and 4.3.

Quiz #7 on F 10/24 covers 3.4, 3.5, and 4.2.

Class 25 (W 10/22): Exercise 23 in 5.5; change of variables reduces Euler equations to constant coefficient linear equations.

Class 24 (M 10/20): cover 4.2.

Class 23 (F 10/17): finish 3.4 and also cover 3.5.

Quiz #6 on F 10/17 covers 3.3 and 4.1.

Class 22 (W 10/15): begin 3.4.

Classes 20 and 21 (F 10/10 and M 10/13): finish 3.3 with the last part of 4.1; Abel's Theorem and uses of the Wronskian for nth order linear homogeneous differential equations.

Quiz #5 on F 10/10 covers 3.1 and 3.2.

Class 19 (W 10/8): begin 3.3.

Class 18 (M 10/6): finish 3.2.

Class 17 (F 10/3): begin 3.2 and the first two pages of 4.1, up to Theorem 4.1.1 (existence and uniqueness for linear differential equations).

Quiz #4 on F 10/3 covers material like problems 2, 3, 4 on Exam #1..

Class 16 (W 10/1): cover 3.1.

Class 15 (M 9/29): discuss results and solutions of Exam #1.

Class 14 (F 9/26): Exam #1 on sections 2.1, 2.2, 2.6, 2.4, 2.3, 2.5, and 2.8 (including handout).

Thursday, 9/25: problem session for Exam #1; 5:00 in room 147 Altgeld Hall.

Classes 10 through 13 (W 9/17 through W 9/24): cover 2.8 and the associated handout.

Quiz #3 on F 9/19 covers 2.3 and 2.5.

Classes 8 and 9 (F 9/12 and M 9/15): cover 2.5.  Quiz #2 (F 9/12) on 2.6 and 2.4.

Class 7 (W 9/10): cover 2.3

Class 6 (M 9/8): finish 2.4 including Bernoulli equations (page 77).

Class 5 (F 9/5): begin 2.4. Quiz #1 on 2.1, 2.2, and 2.6.

Class 4 (W 9/3): finish 2.6.

Class 3 (F 8/29): finish 2.2 and begin 2.6.

Class 2 (W 8/27): finish 2.1, including the method of "variation of parameters" (problem 38, page 41); begin 2.2.

Class 1 (M 8/25): begin 2.1.