Math 385

Math 385 B1 Spring 2005

Instructor: Geumlan Choi

Office: 313 Altgeld
Telephone: 244-1666
E-mail :g-choi1@math.uiuc.edu
Office Hours: Tue: 9:30 AM--11 AM, Wed: 10 AM--11 AM, Thu: 2 PM--2:40 PM, or by an appointment

Tutoring: MTuWTh

Time and Place: 231 Natural History Building, 3 PM--5 PM, and 243 Altgeld Hall, 7 PM--9 PM

Text: Edwards and Penney, Differential equations and boundary value problems 3rd edition

Course Information
Check my current grades
Homework List
Syllabus
Important Policies

Announcements:
Final exam scores are entered. Cutoff points for the semester grade is as follows: A+ (96%), A (90%), A- (89%), B+ (84%), B (77%), B- (73%), C+ (66%), F (below 50%).
Final: 8:00-11:00 AM Mon, May 9 in the regular classroom
Office Hours during final week: Sat and Sun (5/7, 5/8), 1 PM--2:30 PM, or by an appointment
Practice Problems I, Practice Problems II for Section 9.7, Solutions I, Solutions II
Practice Problems for the Final, Solutions: Several Typos has been fixed (solutions for the problems 1d), 3a), 7, 9, 10)
If you want to practice more problems, go over the previous exams, quizzes and the practice problems for exam 1, 2, 3
Drop rule has been implemented for homeworks and quizzes. ** means this score will be dropped.

Practice Problems for Exam 3, Solutions
Practice Problems for Exam 2, Solutions
Practice Problems for Exam 1, Solutions

I forgot to return your quizzes and homeworks today (Wed, Apr 27). You can pick them up from the shelf outside my office door if you want them back before the exam on Friday.
If you want to practice more problems, go over the homework problems and the previous quizzes.
Office hour on Thursday, April 21: 10 AM to 11 AM (note the change of time.)
If you want to practice more problems, go over the homework problems and the previous quizzes.
The problem 12 in section 3.6: The answer in the back of the book is NOT correct. A correct answer is 5sqrt(29)/87 cos (5t-aplha), where aplha=pi+tan^(-1)(2/5). Also note that 5sqrt(29)/87 =5*29/87sqrt(29) =5/3sqrt29, which is the given amplitude in the back of the book.
If you want to practice more problems, go over the homework problems and the previous quizzes.
All left-over quizzes and homeworks are in an envelope on the shelf outside my office door (313 Altgeld). You can come and pick them up at your convenience.
Note that the problem 16 for the section 2.1 is deleted from the homework list. So, you do not have to turn in that problem.
Office hour on Thursday, January 27: 9 AM to 10 AM (note the change of time.)

Homework

	Sections	Due Date	Solutions
Homework 1	1.2, 1.3, 1.4	Wed, Jan 26	Homework Set 1
Homework 2	1.5, 1.6	Wed, Feb 2	Homework Set 2
Homework 3	2.1, 3.1	Fri, Feb 11	Homework Set 3
Homework 4	3.2, 3.3	Wed, Feb 23	Homework Set 4
Homework 5	3.4, 3.5 (except 50, 54, 59, 61)	Wed, Mar 2	Homework Set 5
Homework 6	Problems 50, 54, 59, 61 of section 3.5, and section 3.6	Wed, Mar 9	Homework Set 6
Homework 7	3.8	Wed, Mar 16	Homework Set 7
Homework 8	9.1, 9.2	Wed, Apr 6	Homework Set 8
Homework 9	9.3, 9.4	Wed, Apr 13	Homework Set 9: correction: the answer for the problem 6 of section 9.4: A_0=1/pi, not 4/pi.
Homework 10	9.5, 9.6: Do not just apply the formula in the book. Work through using the separation of variable method as we did in class.	Wed, Apr 20	Homework Set 10

Quiz

	Sections	Date	Solutions
Quiz 1	1.2, 1.3, 1.4	Fri, Jan 28	Quiz 1 Solutions
Quiz 2	1.5, 1.6 (linear first-order equation, homogeneous equation)	Fri, Feb 4	Quiz 2 Solutions
Quiz 3	1.6 (Bernoulli equation, exact equation), 2.1	Fri, Feb 11	Quiz 3 Solutions
Quiz 4	3.1, 3.2, 3.3 (general solutions of linear homogeneous equations with constant coefficients, a problem similar to the problem 22 in section 3.2)	Fri, Feb 25	Quiz 4 Solutions
Quiz 5	3.4, 3.5 (except variation of parameters)	Fri, Mar 4	Quiz 5 Solutions
Quiz 6	variation of parameters in section 3.5, and section 3.6	Fri, Mar 11	Quiz 6 Solutions
Quiz 7	9.1, 9.2	Fri, Apr 8	Quiz 7 Solutions
Quiz 8	9.3, 9.4	Fri, Apr 15	Quiz 8 Solutions
Quiz 9	9.5, 9.6 (a problem similar to the problem 10 in section 9.5)	Fri, Apr 22	Quiz 9 Solutions

Exam

	Sections	Date	Solutions
Exam 1	Chapter 1 and 2.1	Fri, Feb 18	Exam 1 Solutions
Exam 2	Chapter 3	Fri, Apr 1	Exam 2 Solutions
Exam 3	Chapter 9 (except 9.7)	Fri, Apr 29	Exam 3 Solutions
Final		8:00-11:00 AM Mon, May 9