# Math 215 -- Introduction to Linear Algebra

## Spring 2013

 Instructor: Kevin Lin Office: Math 619 Phone: 626-6628 E-mail: klin@math.arizona.edu Course web page (this page): http://math.arizona.edu/~klin/linear Office hours: see here
We meet 8-9:15am every Tuesday and Thursday in
PSYCH 305. Here is the official course policy. (Last updated Mon 03/18/13)

There are additional resources on the math department's Math 215 page. Also check out the tutoring service, as well as these short videos on specific topics from the Khan Academy.

### Announcements

• Homework 16 due Wed 5/1:
Sect 6.1 #1, 3, 5, 12, 14
Sect 6.2 #11, 12
Sect 6.3 #3, 5, 6, 7, 8, 12
Sect 6.4 #1, 2, 9, 10

• Relevant reading in Ch 6:
- 6.1
- 6.2, skipping "decomposing a force into components"
- 6.3
- optional: 6.4, up to "orthonormal bases"
- optional: 6.5, up to Example 4
• Homework 15 due Fri 4/26:
Sect 5.3 #1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 16, 20

• Homework 14 due Tue 4/16 Thu 4/18:
Sect 5.1 #1, 3, 5, 7, 9, 11, 12, 14, 20
Sect 5.2 #1, 3, 5, 9, 10, 12, 15, 18, 19, 20 (added 4/16)

• Homework 13 due Tue 4/9:
Sect 4.5 #1, 3, 5, 6, 10, 11, 13, 14, 21, 22, 24
Sect 4.6 #1, 3, 5, 7, 8, 10, 14, 19, 20, 25, 30

• Homework 12 due Tue 4/2:
Sect 4.3 #1, 3, 5, 7, 9, 10, 11, 13, 15, 16, 19, 20, 26
Sect 4.4 #1, 3, 5, 7, 8, 9 (*), 10, 13, 14, 17, 21
(*) See text for definition of "change-of-coordinates matrix"

• Homework 11 due Tue 3/26:
Sect 4.1 #1, 2, 3, 5, 6, 7, 8, 10, 16, 18, 19, 20(b)
Sect 4.2 #1, 3, 6, 7, 8, 12, 16, 17, 19, 24, 31, 32

• Homework 10 due Tue 3/19:
Sect 3.2 #11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 26, 33, 34, 35, 40

• Homework 9 due Mon 3/4 at 5pm:
Sect 3.1 #1, 2, 3, 4, 5, 6, 9, 10, 12, 25, 26, 27
Sect 3.2 #5, 6, 7, 8, 21, 22

• Homework 8 due Thu 2/28:
Sect 2.2 #1, 3, 5, 6, 7, 8, 13, 16, 18, 21, 31, 32
Sect 2.3 #1, 2, 3, 4, 6, 8, 13, 14, 33, 34, 36
Extra problem (you must turn this in): For the 2x2 matrix in Exercise 1 of Sect 2.3, express both the matrix and its inverse as products of elementary matrices.

• Homework 7 due Thu 2/21:
Sect 1.9 #2, 4, 5, 7, 9, 10, 11, 12, 15, 17, 23, 24, 29
Sect 2.1 #1, 3, 5, 7, 8, 9, 10, 17, 23, 24

• Homework 6 due Thu 2/14:
Sect 1.7 #16, 18, 22, 33, 35, 36
Sect 1.8 #1, 3, 5, 7, 10, 13, 15, 22
Sect 1.9 #1, 2, 3, 4
Sect 1.9 #1, 3, 6

• Homework 5 due Thu 2/7 Fri 2/8:
Sect 1.7 #1, 2, 3, 5, 7, 8, 9, 10, 12, 16, 18, 22, 33, 35, 36

• Homework 4 due MON 2/4:
Sect 1.4 #11, 12, 13, 14, 15, 22, 31
Sect 1.5 #1, 2, 3, 4, 7, 11, 12, 18, 28, 29

• Homework 3 due 1/31:
Sect 1.3 #5, 9, 10, 11, 12, 13, 14, 15, 16, 19, 20, 21, 24
Sect 1.4 #1, 2, 3, 4

• Homework 2 due 1/24:
Sect 1.2 #1, 3, 4, 11, 12, 14, 15, 16, 18, 22, 24
Added 1/22: Sect 1.3 #1, 2, 3, 4
• Homework 1 due 1/17:
Sect 1.1 #3, 4, 5, 7 , 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

Note: the odd-numbered ones are for practice; answers are in the back of your book. You only need to write up and turn in the even-numbered problems. Please write neatly and show all steps.

• I will not require that you use MyMathLab, the on-line homework system. However, if you purchased the text in the bookstore, you do have access to it, and I encourage you to use it for practice. I would be interested in what you think of it, especially compared to WebAssign.

To start using it, read this.

This calendar contains due dates, exam dates, and the sections of the text covered each class. It is subject to change at any time. Check back frequently!

The contents on this site, including but not limited to all documents and source code, are licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License.

This page was last updated on September 16, 2018.