Math 23
Differential Equations
Homework
Chernov’s Section
Lectures 
Sections in Text 
Homework assignment 
Monday January 5 
1.1, 1.2 and start 1.3 
Section
1.1, Exercises 7, 12 Section
1.2, Exercise 8 Section
1.3, Exercise 12 Due Wednesday January 14 
Wednesday January 7 
1.3, 2.1 
Section 2.1 Exercises 15, 17, 33 Due Wednesday
January 14 
Friday January 9 
2.2, 2.4 
Section 2.2 Exercises 3,8, Section 2.4 Exercise 3, 14, 25, 33 Due Wednesday January 14 
Monday January 12 
2.3 
Section 2.4 Exercise 28 Due Wednesday January 21 
Wednesday January 14 
2.5, 2.6 
Section
2.3 Exercises 2, 4 and 8 (part a and b only) Due Wednesday January 21 
Friday January 16 
2.6 
Section 2.6 Exercises 2, 14, 24, and 28. Use exercise 24 to solve the equation (3y^{2}+4xy)+(4xy+3x^{2})y’=0 Due Wednesday January 21 
Monday January 19 MLK day classes moved to xhour 

Wednesday January 21 
3.1, 3.2 
Section 2.5 Exercises 3,13, and 15 (part
a only) Section 3.1 Exercises 11, 12 Due Wednesday January 28 
Thursday January 22 xhour instead of the class on January 19 
3.3, 3.4 
Section 3.2 Exercises 11, 19, 23, 27, 35, 39 Due Wednesday January 28 
Friday January 23 
3.4 
Section 3.3 Exercises 1, 5, 11, 19 Section 3.4 Exercise 2, 13, 14, 23,
25 Due Wednesday January 28 
Monday January 26 
3.5 
Section 3.5 Exercises
1, 2, 13, 14, 16, 18, 19 Due
Wednesday February 4 
Wednesday January 28 First Midterm Exam is 68 PM Thursday January 29 in Silsby 028 
3.6 
Section 3.6 Exercises 10, 15, Section 3.7 Exercise 6, Due
Wednesday February 4 
Thursday January 29 xhour instead of the class on February 13 
3.7, 3.8 
Section 3.8 Exercise 9, 11, Section 4.1 Exercises 2, 6, 8 Due
Wednesday February 4 
Friday January 30 
4.1, 4.2 
Section 4.2 Exercises 13, 16, 17, 21 Due
Wednesday February 4 
Monday February 2 
4.3, 4.4 
Section 4.3
Exercise 3,5 and Section 4.4 Exercise 2, 13 Due Wednesday February 11 
Wednesday February 4 
7.1, 7.2 
Section 7.1 Exercises 5, 9, Section 7.2 Exercises 6.c, 15 Due Wednesday February 11 
Thursday February 5 xhour instead of the class on February 6 
7.3 
Section 7.3 Exercises 3, 8, 19, 25, 29 Due Wednesday February 11 
Friday February 6 Carnival Holiday classes moved to xperiods 

Monday February 9 
7.4 
Section 7.4 Exercises 5, 6, Section 7.5 Exercises 9, 11, 12, 14 Due
Wednesday February 18 
Wednesday February 11 
7.5 
Section
7.6 Exercises 3, 5, 7 (for each system, only solve and express the general
solution in terms of realvalued functions) Section 7.8 Exercises 2, 3, 5 (for each system, only solve and express
the general solution in terms of realvalued functions) Section
7.7 Exercise 1 Due Wednesday February 18 
Friday February 13 No class Instead we have an xhour on Thursday January 29. 

Monday February 16 
7.6 
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 
Wednesday February 18 Second Midterm Exam is 68 PM Thursday February 19 in Silsby 028 
7.8 
Due
Wednesday February 25 
Friday February 20 
5.1, 5.2 
Section 5.4 Exercises 2, 3, 11, 16 Due Wednesday February 25 
Monday February 23 
5.3, 5.4 
Section 10.1 Exercises 1, 5, 10, 14 Due
Wednesday March 5 
Wednesday February 25 
10.1 
Section 10.2 Exercises 14, 15 Due
Wednesday March 5 
Friday February 27 
10.2 
Section 10.3 Exercise 6, Section 10.4 Exercise 16, 17 Due
Wednesday March 5 
Monday March 2 
10.3, 10.4 
Section 10.5 Exercises 3, 5, 9, 10 Due
Monday March 9 
Wednesday March 4 
10.5 
Section 10.6 Exercise 9 part a only, Exercise
13 part a only. Due
Monday March 9 
Friday March 6 
10.6 
Section 10.7 Exercise 9 and Exercise 10
part a only. Due
Monday March 9 
Monday March 9 
10.7 
No Homework 
Wednesday March 11 Thursday March 12 PreExamination Break 


Math 23 Final Exam is 36 PM on Monday March 16 in Wilder 111 

