Answers to your questions 03/01/10:
Administrative questions
1.
On the final, are we going to have to find the rank/inverse for some huge matrix?
For inverse, the largest one will be 3x3. For rank, the largest one will be 3xn. For determinant,
the largest will be 4x4.
2.
A lot of the math classes I took had a “second grading system”, where if we get an A on the final,
we get an A in the class, regardless of previous quizzes/hw/midterms. So you support this policy
as well?
That depends on the average grade of the class. If it is too low, I will follow this policy.
3.
On the lecture notes of section 3.3&3.4, I like how to typed out the definitions and theorems. It
looks neat.
Thanks for the comment. I actually found them on some website, then cut and paste.
☺
4.
Is the class curved?
No. Only the extra credits on questions will be curved.
Questions for today’s lecture
5.
g4668g1876
g2869
+g1876
g2870
=1
, m<n is a consistent system.
g4668g1876
g2869
+g1876
g2870
+g1876
g2871
=1
, m<n is a consistent system.
g3420
g1876
g2869
+g1876
g2870
+g1876
g2871
=1
g1876
g2869
+g1876
g2870
+g1876
g2871
=2
, m<n is an inconsistent system since it doesn’t have a solution.
6.
Is rank basically the same as number of “pivot elements”?
Yes. You can think of it as the number of nonzero pivot elements.
7.
If a row has all 0’s, that means it is linearly dependent; if matrix is linearly dependent, there is no
inverse?
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 Winter '08
 staff
 Linear Algebra, Algebra, Determinant, Inverse, Invertible matrix

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