Math 23
Differential Equations
Homework
For the section taught by Vladimir Chernov
Lectures 
Sections in Text 
Homework Exercises 
Monday September 10 
Read sections 1.1, 1.2 and start section 1.3 
Section 1.1 Exercises 7, 12 Section 1.2 Exercise 8 (a,b) Section 1.3 Exercise 12 Due Wednesday September 19

Wednesday September 12 
Sections 1.3 and 2.1 
Section 2.1 Exercises 15, 17, 33 Due Wednesday September 19 
Friday September 14 
Sections 2.2 and 2.4 
Section 2.2 Exercises 3,8, Section 2.4 Exercise 3, 14, 25, 33 Due Wednesday September 19 
Monday September 17 
Section 2.3 
Section 2.4 Exercise 28 Due Wednesday September 26 
Wednesday September 19 
Section 2.5 
Section 2.3 Exercises 2, 4 and 8 (part a and b only) Due Wednesday September 26 
Thursday September 20 xhour instead of the class on Froday October 5 
Section 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 September 26 
Friday September 21 
Finish Section 2.6 and Section 3.1 
Section 2.5 Exercises 3,13, and 15 (part a only) Section 3.1 Exercises 11, 12 Due Wednesday September 26 
Monday September 24 
Section 3.2, 3.3 
Section 3.2 Exercises 11, 19, 23, 27, 35, 39 Due Wednesday October 3 
Wednesday September 26 
Section 3.4 
Section 3.3 Exercises 1, 5, 11, 19 Section 3.4 Exercise 2, 13, 14, 23, 25 Due Wednesday October 3 
Friday September 28 
Section 3.5 
Section 3.5 Exercises 1, 2, 13, 14, 16, 18, 19 (part a only) Due Wednesday October 3 
Monday October 1 First Midterm Exam is 68 PM Tuesday October 2 in Carpenter 013 
Section 3.6 and start Section 3.7 
Section 3.6 Exercises 10, 15, Section 3.7 Exercise 6, Due Wednesday October 10 
Wednesday October 3 
Section 3.8 and Section 4.1 
Section 3.8 Exercise 9, 11, Section 4.1 Exercises 2, 6, 8 Due Wednesday October 10 
Friday October 5 No class for Chernov’s section, instead we have an xhour on September 20 


Monday October 8 
Section 4.2, Section 4.3, Section 4.4 
Section 4.2 Exercises 13, 16, 17, 21 Due Wednesday October 17 
Wednesday October 10 
Section 7.1, 7.2 
Section 7.1 Exercises 5, 9, Section 7.2 Exercises 6.c, 15 Due Wednesday October 17 
Friday October 12 
Section 7.3, Section 7.4 
Section 7.3 Exercises 3, 8, 19, 25, 29 Section 7.4 Exercises 5, 6 Due Wednesday October 17 
Monday October 15 
Section 7.5 
Section 7.5 Exercises 9, 11, 12, 14 Due Wednesday October 24 
Wednesday October 17 
Section 7.6 
Section 7.6 Exercises 3, 5, 7 (for each system, only solve and express the general solution in terms of realvalued functions) Due Wednesday October 24 
Friday October 19 
Section 7.8 
Section 7.8 Exercises 2, 3, 5 (for each system, only solve and express the general solution in terms of realvalued functions) Due Wednesday October 24 
Monday October 22 Second Midterm Exam is 68 PM on Tuesday October 23 in Carpenter 013 
Section 7.7 
This exercise is not to be submitted and it will not be graded 
Wednesday October 24 
Section 5.1, 5.2 
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.

Thursday October 25 xhour 
Section 5.3 
Section 5.2 Exercises 3, 5, 15(a), 16(a), Section 5.3 Exercises 2, 7, Due Wednesday October 31 
Friday October 26 Homecoming weekend No class, instead we have an xhour on Thursday October 25 


Monday October 29 
Section 5.4 
Section 5.4 Exercises 2, 3, 11, 16 Due Wednesday November 7 
Wednesday October 31 
Section 10.1 
Section 10.1 Exercises 1, 5, 10, 14 Due Wednesday November 7 
Friday November 2 
Section 10.2 
Section 10.2 Exercises 14, 15 Due Wednesday November 7 
Monday November 5 
Section 10.3, 10.4 
Section 10.3 Exercise 6, Section 10.4 Exercise 16, 17 Due Monday November 12 
Wednesday November 7 
Section 10.5 
Section 10.5 Exercises 3, 5, 9, 10 Due Monday November 12 
Friday November 9 
Section 10.6 
Section 10.6 Exercise 9 part a only, Exercise 13 part a only. Due Monday November 12 
Monday November 12 
Section 10.7 
Recommended homework exercise Section 10.7 Exercise 9 and Exercise 10 part a only. This homework will not be collected or graded, but similar exercises may appear on the exam. 
Wednesday November 14  Thursday November 15 PreExamination Break 


Math 23 Final Exam is 11:302:30 PM on Friday November 16 in Kemeny 008 


Final Examinations begin on Saturday November 16 and end on Tuesday November 20 

