Math 23

Fall 2011

Differential Equations

Written Homework

 

Lectures

Sections in Text

Written Homework Assignment

Wednesday September 21, 2010

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 28 in written form

Friday

September 23, 2010

Sections 1.3 and 2.1

Section 2.1 Exercises 15, 17, 33

Due Wednesday September 28 in written form

 Monday September 26

Sections 2.2 and 2.4

Section 2.2 Exercises 3,8, Section 2.4 Exercise 3, 14, 25, 33 Due Wednesday October 5 in written form

Wednesday September 28

Section 2.4

Section 2.4 Exercise 28, Section 2.3 Exercises 2, 4 and 8 (part a and b only) Due Wednesday October 5 in written form

Friday September 30

Section 2.3

No homework

Monday October 3

 

Section 2.5 and start 2.6

Section 2.5 Exercises 3,13, and 15 (part a only) Due Wednesday October 12 in written form

Wednesday October 5

Final day for electing to use the Non-Recording Option.

Section 2.6

Section 2.6 Exercises 2, 14, 24, and 28. 

Use exercise 24 to solve the equation

(3y2+4xy)+(4xy+3x2)y’=0

Due Wednesday October 12 in written form

Friday October 7

Sections 3.1 and 3.2

Section 3.1 Exercises 11, 12

Section 3.2 Exercises 11, 23, 27

Due Wednesday October 12 in written form

Monday October 10

Section 3.2

Section 3.2 Exercises 19, 35, 39

Section 3.4 Exercises 23, 25

Due Wednesday October 19 in written form

Wednesday  October 12

 

Section 3.3 and Section 3.4

Section 3.3 Exercises 1, 5, 11, 19

Section 3.4 Exercise 2, 13, 14

Due Wednesday October 19 in written form

Friday October 14

Section 3.5

Section 3.5 Exercises 1, 2, 13, 14, 16, 18, 19 (part a only)

Due Wednesday October 19 in written form

Monday October 17

6-8 PM First Midterm Exam in Silsby Room 028

Section 3.6 and 3.7

Section 3.6 Exercises 10, 15, due Wednesday October 26

Wednesday October 19

Section 3.7 and  3.8

Section 3.7 Exercise 6, Section 3.8 Exercise 9, 11, due Wednesday October 26

Thursday October 20

x-hour instead of the class on Friday October 21

Section 4.1 and Section 4.2

Section 4.1 Exercises 2, 6, 8,

Section 4.2 Exercises 13, 16, 17, 21 due Wednesday October 26

Friday October 21

Homecoming weekend

No class. Instead we will have an x-hour on Thursday October 20

Monday October 24

Section 5.1 and Section 5.2

Do sufficiently many problems out of Section 5.1 Exercises 1-16 so that you are comfortable with the power series.

These exercises are not to be submitted and they will not be graded.

Wednesday October 26

Section 5.3

Section 5.2 Exercises  3, 5, 15(a), 16(a),  Section 5.3 Exercises 2, 7, due Wednesday November 2.

Thursday October 27

x-hour instead of the class on Monday November 28

Section 5.4

Section 5.4 Exercises 2, 3, 11, 16 due Wednesday November 2.

Friday October 28

Section 7.1 and Section 7.2

Section 7.1 Exercises 5, 9, Section 7.2 Exercises 6.c, 15

due Wednesday November 2.

Monday October 31

Note that Tuesday November 1 is the final day for dropping the fourth course without the grade notation of W

Section 7.3

Section 7.3 Exercises 3 due Wednesday November 9

Wednesday November 2

Section 7.3 and Section 7.4

Section 7.3 Exercises 8, 19, 25, 29 Section 7.4 Exercises 5, 6 due Wednesday November 9

Thursday November 3

x-hour possibly instead of one of the coming lectures

Section 7.5

Section 7.5 Exercises 9, 11, 12, 14 due Wednesday November 9

Friday November 4

Section 7.6

Section 7.6 Exercises 3, 5, 7  (for each system, only solve and express the general solution in terms of real-valued functions) due Wednesday November 9

Monday November 7

6-8 PM Second Midterm Exam in Silsby Room 028

Section 7.8

Section 7.8 Exercises 2, 3, 5 due Wednesday November 16

Wednesday November 9

Section 10.1

Section 10.1 Exercises 1, 5, 10, 14 due Wednesday November 16

Friday November 11

Final day to withdraw from a course

Section 10.2

Section 10.2 Exercises 14, 15 due Wednesday November 16

Monday November 14

Section 10.3 and 10.4

Section 10.3 Exercise 6,

Section 10.4 Exercise 16, 17

Due Monday November 21

 

Wednesday November  16

Section 10.5

Section 10.5 Exercises 3, 5, 9, 10

Due Monday November 21

Friday November 18

Final day to alter the grade limit filed under the NRO

Section 10.6

Section 10.6 Exercise 9 part a only, Exercise 13 part a only.

Due Monday November 21

Monday November 21

Section 10.7

Section 10.6 Exercise 15 part a (show that un(x,t) given in the problem are the solutions coming from the method of separation of variables)

Section 10.6 Exercise 15 part b Hint: This how to extend the function to the interval [-2L, 2L] so that such coefficients cn can be found). Parts a and b of this exercise will count as separate problems when graded.

Section 10.7 Exercise 1 part a only

Section 10.7 Exercise 5 part a only

Due Wednesday November 30

Thanksgiving recess: starts at 5:50 PM on Tuesday November 22 and ends at 7:45 AM on Monday November 28

 

 

Monday November 28

No class. Instead we will have an x-hour on

Thursday October 27

Wednesday November 30

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.

Thursday December 1-Friday December 2

Pre-Examination Break

 

 

Math 23 Final Exam is 8-11 AM Monday December 5 in Silsby 028

Final Examinations begin on Saturday December 3 and end on Wednesday December 7