Math 221, Section 601

Math 221, Differential Equations, , is offered by the Department of Mathematics of the University of Nebraska-Lincoln. This page is for Section 601, which meets at 11:00-12:35 MTWThF in Avery Hall 110 and is taught by Allan Donsig.

Handouts

Policy handout Note: we will do Section 6.1 before Chapter 5 instead of after Chapter 5.

Integration Review

Example of Trig Substitution Integral

Answers to the Integration Review Note: Please don't look at the answers until you have made a serious effort to do the integrals. And by serious, I mean think about it for 15 minutes, then, if that doesn't work, dig out your calculus textbook and look through its chapter on techniques of integration for similar integrals.

Phase planes & nullclines Handout

Linear Systems Handout

Table of Laplace Transforms

Web resources

Here is the webpage for the direction field software that I used in class. math.rice.edu/~dfield/dfpp.html.

I've also listed some advice on How to Lower Your Grade at the bottom of the webpage.

Final Exam

In-class Exams

Friday, July 20 There is a review sheet available for this test. (review sheet answers) Note that this review sheet is for a two hour test; our test will only be one hour. Complete Answers to the test.

Friday, July 27 There is a review sheet available for this test. (review sheet answers) Complete Answers to the test.

Friday, August 3 Complete Answers to the test.

Friday, August 10 Complete Answers to the test.

If you have to miss class when a test is scheduled, you should have a really good reason and, if you can, you should let me know in advance. By really good, I mean University-approved.

To prepare for tests, you are encouraged to

1. prepare a summary of the material, with definitions, theorems, formulas, and methods,
2. review the previous quizzes and tests,
3. review the daily homework. If you had trouble with a daily homework problem, you might want to look at other similar problems in the textbook.
4. After doing all this, then look at the review sheet.

Quizzes (with solutions)

Solution to Quiz 1

Solution to Quiz 2

Solution to Quiz 3

Solution to Quiz 4

Solution to Quiz 5

Daily Homework

1.1: 5,11,15,17,23,31,33,35,43,45

1.2: 6,7,10,15,20,25,28,33,37,44

1.3: 2,7,11,14,18,10,23,26,29

1.4: 1,3,7,10,12,15,21,34,39,43,47,49

1.5: 3,7,11,13,16,17,34,36,38

1.6: 31,33,34,36,37,

1.6: 43,45,46,47

2.1: 3,5,9,15,21

2.2: 3,6

2.2: 7,13,16,17

2.3: 3,7,12

2.3: 7,17,20,22,23

2.4: 2,5,6

2.4: 11,12,15

3.1: 2,7,15,17,20,23,35,38,39,45,47

3.2: 2,8,15,17,18

3.3: 3,6,10,12,17,21,23,30,35,38

3.2: 22,23

3.5: 1,3,6,11,16,20,23,25,31,33,35,36,37

3.5: 47,50,53,55

4.1: 1,5,6,10,24,26

6.1: 1,3,7,9,12

6.1: 24

5.1: 3,5,6,9 (These problems review matrices and their operations)

5.1: 11,14,21,25,27,34,36

5.2: 4,6,8,20,24,28,32,35,39

5.4: 2,6,7,10

5.4: 12

7.1: 1,3,8,9,12,13,16,20,25,26,29

7.2: 2,6,9,10,12,13

7.3: 1,3,7,11,14,15,18,27,29,31,32,35

7.4: 15,17

How to Lower Your Grade

There are several things that will dramatically lower your grade. Doing one or two these things won't guarantee that you'll fail but it will increase the chances a lot. Doing several will almost certainly result in a D or an F, no matter how prepared you are for this course.

Don't come to class. If you do come, don't ask questions or take notes.

Don't do the homework. If you do the homework, do it with the solution manual open in front of you.

Don't study or review old material, except just before the tests.

When you get tests and quizzes back, don't look at the solutions to see how to do the questions you missed.