Math 23
Differential equations
Written Homework
for the section taught by
Vladimir Chernov
Attention: the homework assigned over a week will be due on Wednesday of the next week during the usual class time. The
homework assigned during the week of Tuesday May 26Friday May 29 will be due on Monday June 1
Lectures 
Sections in Text 
Homework Assignment 
Monday March 30, 2009 
Sections 1.1, 1.2 and start 1.3 
Section 1.1 Exercises 7, 12 Section 1.2 Exercise
8 (a,b) Section 1.3 Exercise
12 Due Wednesday
April 8 
Wednesday April 1 We do have a lecture this is not a joke 
Sections 1.3 and 2.1 
Section 1.3 Exercise 12 Section 2.1 Exercises 15, 17 Due Wednesday
April 8 
Friday April 3 
Sections 2.2 and 2.4 
Section 2.2 Exercises 3, 8 Section 2.4 Exercises 3, 14 and 25 Due Wednesday
April 8 
Monday April 6 
Section 2.3 
Section 2.3 Exercises 2,4 and 8 (part a and b only) Due Wednesday
April 15 
Wednesday April 8 
Section 2.5 
Section 2.5 Exercises 3,13, and 15 (part a only) Due Wednesday
April 15 
Friday April 10 
Section 2.6 
Section 2.6 Exercises 2, 14, and 28 Due Wednesday
April 15 
Monday April 13 Final day for electing to use the NonRecording Option. 
Section 3.1 and Section 3.2 
Section 3.1 Exercises 11, 12 Section 3.2 Exercises 11, 23, 27 Due Wednesday
April 22 
Wednesday April 15 
Sections 3.2, 3.4 
Section 3.2 Exercises 19, 35, 39 Section 3.4 Exercise 2, 13, 14 Due Wednesday
April 22 
Friday April 17 
Section 3.3 and Section 3.5 
Section 3.3 Exercises 1, 5, 11, 19 Section 3.5 Exercises 1, 2, 13, 14 Due Wednesday
April 22 
Monday April 20 
Section 3.5 
Section 3.5 Exercises 16 and 18 Due Wednesday
April 29 
Tuesday April 21 xhour instead of the class on Friday April 24 First Midterm
Exam 68 PM in Carpenter 013 
Sections 3.6 
Section 3.6 Exercises 10, 15 Due Wednesday
April 29 
Wednesday April 22 
Sections 3.7 and 3.8 
Section 3.7 Exercise 6 Section 3.8 Exercise 9 Due Wednesday
April 29 
Friday April 24 No class for Chernov’s Section 


Monday April 27 
Sections 4.1, 4.2 
Section 4.1 Exercises 2, 6, 8 Section 4.2 Exercises 13, 16 Due Wednesday
May 6 
Wednesday April 29 
Sections 4.2 and 4.3 
Section 4.2 Exercises 17, 21 Section 4.3 Exercises 13, 15, 17 Due Wednesday
May 6 
Friday May 1 
Sections 4.3 and 5.1 
Do sufficiently many problems out of Section 5.1 Exercises
116 so that you are comfortable with the power series. These exercises
are not to be submitted and they will not be graded. 
Monday May 4 
Section 5.2 and Section 5.3 
Section 5.2 Exercises 2, 3, 15(a), 16(a) Due Wednesday
May 13 
Tuesday May 5 xhour 
Section 5.3 and Section 5.4 
Section 5.3 Exercises 2, 7 Due Wednesday
May 13 
Wednesday May 6 
Section 5.4, Section 7.1 
Section 5.4 Exercises 2, 3, 11, 16 Due Wednesday
May 13 
Friday May 8 
Section 7.2 and Section 7.3 
Section 7.3 Exercises 3, 8, 19, 25, 29 Due Wednesday May
13 
Monday May 11 
Section 7.4, Section 7.5 
Section 7.4 Exercises 5, 6 Section 7.5 Exercises
9, 11 Due Wednesday
May 20 
Tuesday May 12 xhour 
Section 7.5, Section 7.6 
Section 7.5 Exercises
12, 14 Due Wednesday May 20 
Wednesday May 13 Second Midterm
Exam 68 PM in Carpenter 013 
Section 7.6 
Due Wednesday
May 20 
Friday May 15 
Section 7.8 
Section 7.8 Exercises 2, 3, 5 Due Wednesday
May 20 
Monday May 18 Note that Tuesday May 19 is the final day to withdraw from
a course 
Section 10.1 
Section 10.1 Exercises 1, 5, 10, 14 Due Wednesday
May 27 
Wednesday May 20 
Section 10.2 
Section 10.2 Exercises 14, 15 Due Wednesday
May 27 
Friday May 22 
Section 10.3 and Section 10.4 
Section 10.3 Exercise 6, Section 10.4 Exercise 16, 17 Due Wednesday
May 27 
Monday May 25 Memorial Day No class 


Wednesday May 27 Final day to alter grade limit filed under the
NonRecording Option. 
Section 10.5 
Section 10.5 Exercises 3, 5, 9, 10 Due Monday June
1 
Friday May 29 
Section 10.6 
Recommended
homework: Section 10.6 Exercise 9, 13 parts a only. The homework exercises for this day will not be graded. 
Monday June 1 
Section 10.7 
Recommended
homework: Section 10.7 Exercise 1, 5 parts a only. The homework
exercises for this day will not be graded. 
June 34 PreExamination Break 


Math 23 Final
Exam is 36 PM Friday June 5 in Moore Filene Final Examinations begin on Friday June 5 and end on
Tuesday June 9 

