Math 217 Spring, 2019





Instructor: Steven G. Krantz

Textbook: Differential Equations: Theory, Technique, and Practice, by Steven G. Krantz, second edition, Chapman and Hall/CRC Press, Boca Raton, FL, 2014.

Office: 103, Cupples I

Office Hour: Monday, Wednesday, Friday 12:15pm-1:15pm.

Phone: (314) 935-6712


Personal Web Address:

Class Web Page: The class Web page is

You can also just go to my personal Web page (above) and click on the button

for Math 217.

Dept. Office: 100, Cupples I

Dept. Phone: (314) 935-6760


Course Description: The purpose of this course is to learn about the theory and solution of ordinary differential equations. We will learn to recognize and to solve a variety of differential equations, and we will learn a variety of applications to physical and engineering problems.

The course will follow the text rather closely. But it is strongly advised to attend class, as the instructor will offer many ideas and insights not to be found in the book. It is also important to keep up with the homework.

Work Required in the Course: There will be weekly homework assignments of two types. There will be OnLine problems using WebWork. WebWork is handled through wustlkey. The URL is There will also be handgraded problems which you will submit using another OnLine system called CrowdMark.

What is nice about WebWork is that it grades your problems in real time so that you get instant feedback. More information about how to access WebWork will be provided in due course.

The University has specified that we have three miderm exams (on February 5, March 5, and April 9 from 6:30pm to 8:30pm in rooms to be specified) and a final exam. The final exam is at 10:30am on May 3. If you cannot make one of these exams then you should tell me (the instructor) at least a week in advance so that other arrangements can be made. You find out your room and seat assigment for each exam by logging on, on the morning of the exam, to .

The relative weights of the course components are as follows:

Homework: 20%

Midterm I: 20%

Midterm II: 20%

Midterm III: 20%

Final Exam: 20%

TOTAL: 100%

If you are taking the course Pass/Fail, then the cutoff for a pass is C - or 65 percent.

I will conclude here with a variety of useful information:

1. The Math Department mandates that we have three midterms. They are scheduled on February 5, March 5, and April 9 from 6:30pm to 8:30pm in the evening. You can find out what room to go to and what your seat assignment is for each exam by logging on, on the morning of the exam, to

2. To access WebWork, you need to go to and select Math 217. Your username and your password are both your student ID number. The password should be changed as soon as possible.

3. The Assistant to the Professor for this course is Christopher Felder. His emails are or He will have office hours on Mondays from 4:00pm to 5:00pm and on Thursdays from 2:30pm to 3:30pm in Room 8, Cupples I. He will not staff the Calculus Help Room in Room 6, Cupples I but there are other graduate students there who can help you. You can find more information about Calculus Help Room hours at .

4. I do not allow calculators during exams.

5. Your exam and homeworkgrades may be found on an OnLine system to be announced.

6. Disability Resources: Special accommodations for exams are offered to students who are registered at Disability Resources (DR). Information about DR may be found at Students who desire to take advantage of this service should visit DR early in the semester, well before the first exam.

8. This Web page is the lifeline of the class. Homework assignments, additional course information, corrigenda, exam information, and other announcements will all be posted here. Bookmark the page and refer to it frequently.

Here is some essential information about the First Midterm for Math 217:

a) The exam is on February 5 from 6:30pm to 8:30pm. On the morning of the exam, go to to find out your room and seat.

b) You can bring one 4" x 6" card with notes to the exam.

c) You cannot bring a calculator or tablet or computer.

d) There are approximately seven multiple choice questions, one TRUE/FALSE, and two written-out questions (this could vary a bit). For the first eight of these you will be given a ScanTron card to record your answers. The last two you will write out on the exam.

f) Exam grades will be recorded OnLine at a URL to be specified.

FIRST HOMEWORK ASSIGNMENT. Due Friday, January 25 OnLine.

pages 9-12, #1bdf, 2bc, 3bd

page 15, #1abdg, 2acd

pages 19-20, #1abdg, 2bdf

Solutions to Midterm 1

Solutions to CrowdMark Homework 1

Midterm 1 Practice Exam

Midterm 1 Practice Exam Solutions

SECOND HOMEWORK ASSIGNMENT. Due Friday, February 1 OnLine.

pages 24-25, #2, 4, 8, 10

pages 29-30, #1bd, 2, 3

page 33, #1bdf, 4a

page 37, #1bdfh

page 42, #1bdf, 2b

Solutions to CrowdMark Homework 2

THIRD HOMEWORK ASSIGNMENT. Due Wednesday, February 20, 2019 OnLine.

Section 2.1, #1abemq, 2acd, 6ac

Section 2.2, #1adgk, 2ace

Section 2.3, #1ace, 2ac, 5ae

Section 2.4, #1ab, 2

Section 2.5, #1, 2, 6

Solutions to CrowdMark Homework 3

FOURTH HOMEWORK ASSIGNMENT. Due Monday, March 4, 2019 OnLine.

pages 164-165, #1, 3, 4, 6

pages 169-170, #1bd, 2ad, 3

pages 176-178, #1bd, 2, 4a

pages 182-184, #1bd, 2bd, 3bc, 4bd

Solutions to Midterm 2

Practice Exam for Midterm 2

Solution to Practice Exam for Midterm 2

Solutions to CrowdMark Homework 4

Supplement to Solutions to CrowdMark Homework 4

FIFTH HOMEWORK ASSIGNMENT. Due Wednesday, March 27, 2019 OnLine.

Section 6.1, #1, 2, 3, 5ac, 6a

Section 6.2, #2, 3a, 4, 5ab

Section 6.3, #1, 2, 4, 6, 7

Solutions to CrowdMark Homework 5

SIXTH HOMEWORK ASSIGNMENT. Due Monday, April 8, 2019 OnLine.

pages 285-287, #1acf, 2

pages 293-4, #1, 4, 5

pages 300-301, #1acd, 2, 4

pages 304-305, #1, 2, 3

Practice Exam for Midterm 3

Solutions to Practice Exam for Midterm 3

Solutions to CrowdMark Homework 6

SEVENTH (AND LAST) HOMEWORK ASSIGNMENT. Due Friday, April 26, 2019 OnLine.

pages 319-20, #1, 4bd, 5bd

page 324, #1ae, 2ac, 3ac

pages 329-30, #1, 2ac, 3a

pages 337-8, #1, 2ac, 5

pages 344-5, #1ac, 3ac

Solutions to Midterm 3

Solutions to CrowdMark Homework 7

Practice Final Exam

Solutions to Practice Final Exam

Solutions to Final Exam