Instructor: Dr.
Dashun Xu
Office: 273
Neckers Hall A Wing
Office Hours: MWF 11:5512:55pm, 1:55pm2:55pm, or by
appointment
Email: dashunxu@siu.edu Phone: 4536598
Zoom meeting room: 222 336 4190
Textbook: Elementary
Differential Equations & Boundary Value Problems, by Boyce and DiPrima 10^{th} ed
Grading scale:
Grading
Scale
Grades
Midterm
exams

35

Homework

25

Final

32

Attendance
(deduct 1 point per missed class meeting)

8

Important dates
Semester Classes Begin

Monday,
August 19

Last Day to drop w/ Reg.
Office

Friday,
August 30

Last Day to Drop with Refund

Sunday,
September 1

Labor Day Holiday

Monday,
September 2

Last Day to Drop w/o Refund

Sunday,
October 27

Fall Break

Friday,
October 18

Veterans Day

Monday,
November 11

Thanksgiving Break

Nov 23 –
Dec 1

Final Examinations

Dec 9 –
Fri, Dec 13

Homework:
All
assignments will be collected every Friday in class and only a few questions in each
assignment will be graded. Late homework will not be accepted. The
followings are problems assigned last time. I will update these
problems after each class meeting. Please make sure to refresh the webpage
Date

Homework


Week 1

Announcement 1 and 2 posted above. Due on Fri in
class

Please use the 10^{th}
edition of the textbook to do the homework problems. Otherwise, will
be marked wrong!

Week 2

1.3: 16, 8, 9;;
2.1: find the
general sol. to 1,3,5,7
2.1: (find the
general solutions, i.e. part c ) 9,11, 13,
15,
2.2: 1, 2, 5, 6, 7, 13(a,c)

Due on Fri.
Please donot
forget to staple your homework sheets together.
This webpage is updated according to the lecture
pace on MWF. That is, you can get all HW due on each Fri till Wed
after class.

Week 3

2.1: 17, 19;;
2.2: find the
solution to 14, 22;
2.6: 3, 7, 11, 14, 15


Week 4

2.6: 9, 13
(find the solution);
2.6: (optional: 21; 22,)
2.6: 25, 26, 27, 28, 30;
2.4: 2, 5, 7, 11

Practice exam 1 (for
you to review Chap 2)
HW due on Fri.

Week 5

2.4: 28, 29, 30, 31
2.5: 3, 4, 7, 10

HW due on Fri.
Exam on Wed. (9/25)

Week 6


HW also due on
Fri.

Week 7

3.1: 1, 3, 9, 13, 15, 20
3.2: 9, 13,
Optional: 3, 5, 11, 26
3.3: 7, 11,
17, 19, 21 Optional 9, 12, 15, 20

If possible, I still strongly recommend
you to do all problems.
Due on Fri.

Week 8

3.4: 7, 11, 13, 23, 27, 28, Optional: 12, 25, 29, 30,
3.5:
1, 3

Practice for Chap3

Week 9

3.5:
5. 7, 9, , 16, 17, 18
3.5:
21(a, donot solve), 22a, 23(a), 24(a), 25(a)
3.5: Optional:
6, 8, 10, 19
3.6: 5, 7, 13,
17, optional: 3, 4, 14, 16, 18

Due on Fri.

Week 10

4.1: optional:
14, 15, 16
4.2: 11, 14, 16, 18, 20, 22,
find solution to IVP: 31; optional: 13, 18, 19, 24, 35


Week 11

4.2: 17, 19, 23, find solution
to IVP: 29
4.3: 2, 3, 6, 9,
4.3: 13, 15, 16,
17, Optional: 1, 10, 12, 14,
16, 18

Practice for Chap4
HW due on Fri.

Week 12

4.4: 2, 3, 9
10.1: 1, 3, 4
10.1: 14, 16,
Optional: 2, 5,

Homework due on
Fri.
Second
Exam on Fri???
Covering
Chap3, 4, and 10.1.

Week 13

10.1: 18
10.2: 13, 15
HW due also on Fri.


Week 14

10.2: 14, 16
10.3: 1, 2, 3,
10.3: 7a,
9a, 11a

Due on Fri


10.4: 7, 8, 9, 15, 16, 24(a,b)
10.5: 1, 2, 5, 6,
10.5: 7, 8 after watching the video
for 10.5.


Week 15

Practice for the final:
Midterm exams and their practice exams,
homework problems for Chap10.2—10.5

Final exam: Mon (12/9),
12:30—2:30pm

Study Hint:
Find at least one or
two other students from the class with whom you can regularly do
homework and prepare for exams. Your classmates are perhaps the least
used and arguably your best resource. An efficient and effective study
group will streamline homework and study time and greatly improve your
written and spoken communication. The best time to use your classmates
as study/homework partners is after you have made an honest effort
on your own to solve the problems using your own wits, knowledge,
and experience. When you encounter an unsolvable problem, don't give up
too soon on it. Being stumped is an opportunity for mathematical growth
and insight, even if you never solve the problem on your own. If you
seek help prematurely, you will never know if you could have solved a
tough problem without outside assistance.
