## Math 24 Comments and Questions Page

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Name: TRS March 09, 1999 (08:01) Yes, my copy has a part k

Name: J Ruiz March 08, 1999 (14:50) On the first problem of the last homework assignment, I was givcen 9/10 because i failed to include part (k). However, my book doesn't have a part (k) on page 247 #1. I don't particularly care for the point, but do other people's books have a (k)?

Name: TRS February 19, 1999 (07:54) No, it is not necessary to justify the techniques for that problem, but of course show the steps.

Name: Blythe Adler February 18, 1999 (19:27) if we have used a technique for solving systems of linear equations, finding a basis for the solutions, etc in class (but never formally justified it) is it necessary to justify it on the exam?

Name: TRS February 18, 1999 (15:17) Just take the sum of the (1,1) and (2,2) entries.

Name: Anonymous February 18, 1999 (15:16) How does one go about finding the trace of a 2X5 matrix? i though only nXn matrices had traces.

Name: TRS February 17, 1999 (11:16) Roughly 2.1 - 2.4 and large pieces of 3.1 - 3.4 (but for chapter 3 material, you are better off relying on class notes).

Name: Karen Kam February 16, 1999 (12:01) Could someone please clarify which sections we are going to be tested on. Is it 2.1 to 2.4. what about 3.3? Thanks, Karen

Name: TRS February 11, 1999 (08:04) It isn't necessary, but the characterization using matrices (and hence assuming finite dimensionality) is much more visual.

Name: Dave Latham February 10, 1999 (18:26) Why can we assume it when asked to characterize all such transformations?

Name: TRS February 10, 1999 (17:41) Latham: Yes finite dimensional. You may actually assume it when asked to characterize all such transformations

Name: TRS February 10, 1999 (17:39) Lulich: Yes I did it again....

Name: Dave Latham February 10, 1999 (16:19) For the extra part of question 16, we can assume V is finite dimensional?

Name: Steven Lulich February 09, 1999 (14:35) Professor Shemanske, the homework page says we are to do #11 on page 91 twice...

Name: TRS February 09, 1999 (11:03) Lulich: The A, B, C is a way of conveying that the matrix has a particular "block" form. What the problem is really asking is for you to find a basis of V so that the matrix of T with respect to this basis has all zeroes in the lower left (n-k) X k block. The A, B, C indicate that the other entries may be arbitrary.

Name: Steven Lulich February 08, 1999 (18:50) On number 10 on page 79, what are B and C?

Name: TRS January 21, 1999 (17:29) No, I guess I really liked those problems though. But now that you're underworked, I'll have to find a couple of other problems to occupy those long evenings.... Thanks for the observation.

Name: andy pierce January 21, 1999 (14:54) prof. shemanske, two of the problems for the next assignment were on the last assingment. want us to do them again?

Name: doug fenton January 20, 1999 (21:44) got everything but problem 14 on page 39. help anyone????????? i can give hints on all other problems.

Name: andy pierce January 13, 1999 (20:19) lulich: each space in the matrix can either be a 0 or a 1, so since there are mn spaces in the matrix, there are 2^mn possible matrices. for example, a 2x2 matrix has four spaces and each space can be either a 0 or a 1, so there are 2^(2*2) = 2^4 possible matrices.

Name: Steven Lulich January 13, 1999 (11:26) That's for #22, p. 15, by the way...

Name: Steven Lulich January 13, 1999 (11:24) I don't understand why the number of elements in an mxn matrix is 2^(mn) rather than simply mn.

Name: TRS January 12, 1999 (10:11) Madden: Have you thought about the zero vector or scalar?

Name: Darcy Madden January 11, 1999 (15:39) For prob #1, pg. 12, parts c and d, the answer is supposed to be false...could someone explain to me why these are false? Thanks!

Name: TRS January 12, 1999 (10:02) Pierce: Sure give a reason; I want to know what you're thinking.

Name: andy pierce January 11, 1999 (13:53) for the first problem on page 12, do we have to give reasons, or just say whether or not the statement is true?

Name: T. R. Shemanske January 10, 1999 (13:15) This page can be used by students to post comments or questions. If questions get posted, feel free to offer an answer if you can. I will try to monitor the page regularly and provide answers as well.