Introduction to Linear Algebra Fall 2023)

(Math 221, MWF 10:00-10:50AM, Eng. A 220)

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Instructor:  Dr. Dashun Xu

Office: 273 Neckers Hall A Wing
Office Hours: MWF 8:30-9:50am, 2:00pm-2:50pm, or by appointment

E-mail: dashunxu@siu.edu Phone: 453-6598

Zoom meeting room: 222 336 4190

Syllabus (Attachment for more useful webpage and dates)

Textbook: Elementary Linear Algebra, by Howard Anton 11th ed.

Tutoring sessions: Lib 680 Mon-Thurs. from 5-9 -p.m

Important dates:

 

Semester Classes Begin

Monday, August 21

Last Day to Register

Sunday, August 27

Last Day to drop w/ Reg. Office

Friday, September 1

Last Day to Drop with Refund

Sunday, September 3

Labor Day Holiday

Monday, September 4

Last Day to Drop w/o Refund

Sunday, October 29

Thanksgiving Break

Sat, Nov 18 Sun, Nov 26

Thanksgiving Holiday

Thurs, Nov 23 Fri, Nov 24

Final Examinations

Mon, Dec 11 Fri, Dec 15

 

 

Grading scale:

Grading Scale

90 A

80 B

70 C

60 D

59 F

Grades

Midterm exams

35

Homework

25

Final

32

Attendance (deduct 1 point per missed class meeting)

8

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. I will update these problems after each class meeting. Please make sure to refresh the webpage

Date

Homework

 Week 1

Sect 1.1: 5, 7(c), 8(c)

 

Week 2

Sect 1.2: 3(a, c,d), 5, 11, 15, 25, 27

Sect 1.3: 2(b, c), 3(e. f), 5(a, b, d, e),

 

Sect. 1.3: 11, 13(a), 15, 23

Together with Week 1, Due on Fri.

 

Please donot forget to staple your homework sheets together.

 

This webpage is updated according to the lecture pace in the afternoon (after 2pm) on MWF. That is, you can get all HW due on each Fri till Wed after 2pm. 

Week 3

Sect 1.3: 1(d, e), 5(g, k), 29(a,b)

 

1.4: 9, 12, 13, 15, 17, 20c, (using inverse 25, 27), TF(a-k)

 

 

 

Week 4

1.5: 2, 5(c), 6(b), 7, 8(ac), 11, 13, 15, 17, 19, 20, TF(a-g)

 

1.6: 1, 7, 9, 12,

 

1.6: 13, 15, TF(a-g)

1.7: 3, 9, 15, 19, 21, 27, 35(b), TF(a-m)

 

 

 

Week 5

 

2.1: 1, 16, 19(a,b), 27, 29, 31

 

2.2: 6, 7, 11, 15, 17, 18, 19, 21, optional (23, 25,27, 29, 30 )

 

 

Week 6

 

2.3: 7, 15, 17, 19, TF (a-l)

2.3: 25, 33;

3.1: 1(a), 3, 11(a,c), 19

 

 

Review Problems:

1.2: 11, 25, 27

1.4: TF(ag)

1.6: TF(af)

1.7: TF(jm)

2.1: 21, 22,

2.2: 15--22

2.3: 19, 21,

Homework are also collected on Fri.

 

Exam on Fri!!! Covering Chap1 and 2, including HW for 2.3 this week.

Week 7

3.2: 1(a), 5(a), 9(a)

 

 

Homework are also collected on Fri.

 

 

Week 8

3.2: 19,

3.3: 1cd, 3, 7, 10, 13b, 19

 

 

Week 9

4.1: 8, 9, TF a-e.

 

Week 10

4.2: 7, 11, 12(a,c),

4.3: 1(a,b), 2, 3

 

Week 11

4.4: 2, 11(a), 13(a), 19(a, b), TF(a-d)

4.5: 1, 3, 5, 15, 17,

4.6: 1(abc), 3(ab)

Week 12

4.7: 3a, 7b, 9, 15, 17

4.8: 1, 6

 

 

Week 13

 

HW:

4.7; 11, 12

4.8: 1b, 3, 5, 6

5.1: 7, 12, 13,

 

 

Review: 4.2: 11, 12(ab)

4.3:2b, 3b

4.4: 13a, 19ab,

4.7: 9, 15, 16, 17

 

Exam on Friday???

Week 14

HW due on Fri.

5.2: 3, 6, 8, 9, diagonalize 13, 17

 

 

Review for the final: Week 7 and 13 homework and two review sets for midterm exams, together with

1.5: 11, 13,

2.3: 33, 34

4.2: 2(a, b, d, e)

5.2: 9, 11

Thm in 4.8

 

Review Lecture notes for chap6.

Practice: 6.1: 29, 30, TF(a-f)

6.2: 1, 15, 16, 27

 

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.

 

 

 

 

 

 


                                    Last modified 8/15, 2023 by Dashun Xu..