# Linear Algebra (Math 220) Assignments

#### Spring Semester, 2003

Assignments are listed by the date due.

PDF and DVI (requires TeX software) versions of this page are available for printing.

Most of these assignments are simply exercises designed to prepare you for the quizzes and the written assignments. Those which are to be submitted as written assignments are so labeled. While you may find it helpful to discuss the exercises with others, no collaboration is permitted on the written assignments.

Wed., May. 14:

Final Examination, 3:30 - 5:30

Tue., May. 13:

Office Hours : 2:30 - 3:30

Mon., May. 12:

Office Hours: 12:30 - 1:30

Fri., May. 9:

Office Hours: 3:00 - 4:00

Mon., May. 5:

Review Session: bring questions

Fri., May. 2:

Review Session: bring questions

Wed., Apr. 30:

Affine Maps
Definition.   If V is a vector space, a translation t : V --> V is a map that is given by t(x) = x + a for some a in V and all x in V.
Definition.   If V is a vector space, an affine map f : V --> V is a map that may be written as the composition t \circ l where l : V --> V is a linear map and t : V --> V is a translation.
Note that saying f = l \circ t i.e., f(x) = l(x + a) for some a in V, rather than f = t \circ l, i.e., f(x) = l(x) + a for some a in V, would change the definition of affine map.

Exercises:

1. Find an affine map f of R^{2} for which f(0, 0) = (1, -1), f(1,0) = (4, -1), and f(0, 1) = (4, 3).

2. When f is an affine map, let lambda(f) denote its linear component. Show that lambda(g \circ h) = lambda(g) \circ lambda(h).

3. Show that an affine map f is invertible if and only if its linear component lambda(f) is invertible.

4. (Corrected) Show that if f is an invertible affine map of V and t a translation of V, then f \circ t \circ f^{-1} is a translation.

Mon., Apr. 28:

Exercises:
430: 18
437: 24, 26, 29
284: 26, 28
368: 16, 20
385: 1, 5

Fri., Apr. 25:

Exercises:
430: 11
437: 18
284: 15 - 18, 22
368: 6, 7, 10, 13, 14

Wed., Apr. 23:

Exercises:
417: 16 - 18
430: 10(f, h, j), 12
437: 11, 17
284: 10 - 12
368: 2 - 5

Mon., Apr. 21:

Exercises:
417: 12, 15
429: 7, 9, 10(a, c, e)
437: 3, 4, 7
283: 1 - 3, 5, 7

Wed., Apr 16 - Fri., Apr 18:

University Recess: No class.

Mon., Apr. 14:

Exercises:
359: 40
406: 20, 21, 23
417: 11, 13, 14
429: 5, 6
437: 1

Fri., Apr. 11:

Exercises:
359: 38, 39
406: 11, 12, 18, 19
417: 4, 6, 7, 9, 10
429: 3

Wed., Apr. 9:

Exercises:
359: 29, 30 - 35
395: 16, 18, 19, 20
406: 6 - 8, 14, 15
417: 1, 3

Mon., Apr. 7:

Exercises:
349: 33, 34
359: 23, 24, 26, 28
395: 15, 21, 23
406: 3, 5

Fri., Apr. 4:

Exercises:
348: 26, 28, 29
358: 16, 17, 19, 20, 22
395: 10, 11, 14
406: 2

Wed., Apr. 2:

Exercises:
336: 30, 32, 34
348: 20, 21, 23 - 25
358: 7, 12, 15
394: 3, 6, 8, 9

Mon., Mar. 31:

Exercises:
315: 19, 21, 22, 25, 26
336: 26 - 29
348: 8, 9, 11, 12, 18, 19
358: 1 - 5, 9, 11

Fri., Mar. 28:

Exercises:
301: 38 - 41
315: 16 - 18
336: 11, 12, 16, 17, 23, 25
347: 2, 3, 5, 7

Wed., Mar. 26:

Exercises:
301: 25, 35
315: 8, 11, 15
336: 2 - 4, 7 - 9, 15

Mon., Mar. 24:

Exercises:
271: 30, 31, 35
300: 14 - 16, 30, 31
315: 3, 5, 9, 13
325: 6

Fri., Mar. 21:

Exercises:
262: 24, 25, 28, 32
271: 6, 8, 17, 21, 29, 38
300: 7 - 9, 19, 23
315: 1, 4

Wed., Mar. 19:

Exercises:
227: 24, 26, 34
248: 38, 41, 46, 49
262: 22, 26, 30
271: 15, 16, 20, 28
300: 1 - 5

Mon., Mar. 17:

Exercises:
228: 31 - 33
248: 8, 9, 16, 17, 20, 21, 25, 33
261: 4, 8, 13, 15 - 21
271: 2, 5

Fri., Mar. 14:

Exercises:
227: 23
236: 9, 10, 14, 15
248: 4, 7, 10 - 12, 15, 19
261: 3, 7

Wed., Mar. 12:

Midterm Test

Mon., Mar. 10:

Review Session. Bring questions.
Be sure to obtain a copy of the handout (also available as PDF or DVI) that supplements the class of Fri., Feb 28.

Recess
Mar. 1 - Mar. 9

Fri., Feb. 28:

Exercises:
203: 34, 35, 37, 38, 41, 42
211: 12, 21
226: 10 - 12, 20, 21
236: 1 - 8, 11, 12

Wed., Feb. 26:

Exercises:
152: 33
190: 25
201: 29 -32, 40
211: 6 - 9, 11, 19
226: 1 - 5, 16, 17

Mon., Feb. 24:

Exercises:
152: 19, 20, 25, 26, 29, 31
190: 23, 24
201: 19 - 22, 25, 27, 28
211: 1 - 5, 10

Fri., Feb. 21:

Exercises:
152: 21 - 24
189: 3, 16 - 18
201: 1 - 6, 8, 9, 11 - 14

Wed., Feb. 19:

Exercises:
135: 31, 37
140: 5, 6, 14, 15, 17, 21
152: 9, 10, 14 - 16
189: 1, 2, 9 - 15

Mon., Feb. 17:

President's Day Recess: no class

Fri., Feb. 14:

Exercises:
100: 45, 46
135: 24, 25, 27, 28, 32
140: 7, 10, 11, 13, 18 - 20
152: 1 - 8, 13

Wed., Feb. 12:

Exercises:
100: 32, 36, 38, 42, 44
135: 11, 13, 14, 16, 22, 23, 26, 30
140: 1 - 4, 12

Mon., Feb. 10:

Expect at least one quiz this week.
If you find § 2.1 opaque, it is likely that you have not fully digested § 1.6.
Exercises:
86: 33, 34, 38
100: 26, 27, 29, 31, 34, 35
134: 1 - 5, 7, 9, 10, 12

Fri., Feb. 7:

Exercises:
68: 35 - 39, 44, 45, 47, 48
84: 15, 16, 20, 23, 25 - 27, 29, 30
99: 12, 13, 16, 17, 19, 23 - 25

Wed., Feb. 5:

Exercises:
48: 45, 46
68: 26, 27, 29, 30 - 34, 43, 56
84: 9, 10, 11, 13
99: 1 - 10

Mon., Feb. 3:

Exercises:
46: 24, 36, 39, 41
68: 11, 12, 23, 25, 42
84: 6, 7

Fri., Jan. 31:

Exercises:
16: 21, 23, 27, 32, 35, 38, 39
31: 5, 8, 11, 14, 16, 19, 22, 23
46: 3, 4, 11, 12, 17 - 19, 23

Wed., Jan. 29: