Math 217 Fall, 2023





Instructors: Steven G. Krantz and Victor Wickerhauser

Textbook: Differential Equations: Theory, Technique, and Practice, by Steven G. Krantz, third edition, Chapman and Hall/CRC Press, Boca Raton, FL, 2022.

Office: 103, Cupples I

Office Hour: Krantz: MWF 12:00pm-1:00pm.

Phone: (314) 935-6712


Class Web Address:

Personal Web Address:

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 using an OnLine system called WebWork. WebWork is handled through wustlkey. The URL is The TAs will go over the WebWork problems in the weekly problem sessions. 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. In fact you can access the first WebWork assignment in the following way: Go to In the middle of the page click on "WebWork." Then click on "Load WebWork in a New Window."

The University has specified that we have three miderm exams (on September 20, October 18, and November 15 from 6:30pm to 8:30pm in rooms to be specified) and a final exam. The final exam is 10:30am-12:30am on December 15. 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
If you are taking the course Pass/Fail, then the cutoff for a pass is C- or 65 percent.

The relative weights of the course components are as follows:

Homework: 15%

Attending Recitation: 5%

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. 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.

2. The Assistants to the Professor for this course are Devin Akman (, Lars Nilsen (, and Justin Rockaway ( They will have office hours to be announced.

3. I do not allow calculators during exams.

4. Your exam and homework grades may be found on an OnLine system to be announced.

5. 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.

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

Practice Exam for Midterm 1

Solutions to Practice Exam for Midterm 1

Solutions to Midterm 1