(New page: = This is the review for Chapter 3 and 4. The problems posted here are the one that I consider hard. Hope it can help. = = 3.1 11 Ax = 0 to find the span,very basic but very important<br>...) |
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| − | = 3. | + | = This is the review for Chapter 3 and 4. The problems posted here are the one that I consider hard. Hope it can help. = |
| − | = 3. | + | = 3.1 11 Ax = 0 to find the span,very basic but very important<br> = |
| − | = 3. | + | = 3.115 By Fact 3.1.3, the image of A is the span of the columns of A, any two of these vectors span all of R2 already. = |
| − | = <br>4.1 11 Not a subspace: I3 is in rref, but the scalar multiple 2 I3 isn't.<br> <br>4.2 53 Thus the kernel consists of all constant polynomials f(t) = a(when b = c = 0), and the nullity is 1. = | + | = 3.2 4 Fact 3.2.2.<br> = |
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| + | = 3.2 12 Linearly dependent<br> = | ||
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| + | = 3.3 5 The first two vectors are non-redundant, but the third is a multiple of the first. = | ||
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| + | = 3.4 17 By inspection, we see that in order for x to be in V , x = 1v1 + 1v2 + 1~v3 = | ||
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| + | = <br>4.1 11 Not a subspace: I3 is in rref, but the scalar multiple 2 I3 isn't.<br> <br> = | ||
| + | |||
| + | = 4.2 53 Thus the kernel consists of all constant polynomials f(t) = a(when b = c = 0), and the nullity is 1. = | ||
= <br> = | = <br> = | ||
Revision as of 14:42, 30 April 2011
Contents
- 1
- 2 This is the review for Chapter 3 and 4. The problems posted here are the one that I consider hard. Hope it can help.
- 3 3.1 11 Ax = 0 to find the span,very basic but very important
- 4 3.115 By Fact 3.1.3, the image of A is the span of the columns of A, any two of these vectors span all of R2 already.
- 5 3.2 4 Fact 3.2.2.
- 6 3.2 12 Linearly dependent
- 7 3.3 5 The first two vectors are non-redundant, but the third is a multiple of the first.
- 8 3.4 17 By inspection, we see that in order for x to be in V , x = 1v1 + 1v2 + 1~v3
- 9 4.1 11 Not a subspace: I3 is in rref, but the scalar multiple 2 I3 isn't.
- 10 4.2 53 Thus the kernel consists of all constant polynomials f(t) = a(when b = c = 0), and the nullity is 1.
- 11
