Math 225 M1, Fall 2006

Tuesday/Thursday 9:00 - 9:50am Altgeld Hall Room 347

Important links:

Class Syllabus
Gradebook
Suggested Problems

Class log:

DateThings covered in classHomework
8/24 Section 1.1. Definitions relating to systems of linear equations, translation into matrices, elementary row operations. The magical form that we want to transform matrices into will be discussed in the next lecture. Due Tuesday 8/29: Read sections 1.1 and 1.2. From section 1.2 turn in Exercise 1. From Section 1.1 turn in Exercises 1, 4, 7, 17, 19, 20, 21, 23, 24 and additional problem
8/29Row echelon form, Reduced Row Echelon Form, Pivots, free and basic variables, general solutions, existence and uniqueness of solutions based on the echelon form. Homework due Thursday 8/31: Understand what Theorems 1 and 2 in section 1.2 are saying (pages 15 and 24). Read section 1.3 and turn in problem 5. Homework due Thursday 9/7: Section 1.2 problems 1, 2, 3, 5, 9, 11, 12, 15, 17, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33. Note: A LOT of those are true/false or short answer questions
8/31Section 1.3Homework due Tuesday, 9/5: Read section 1.4, turn in exercise 1 and 2. Homework due Thursday, 9/7: section 1.3 problems 5, 6, 8, 10, 11, 12, 13, 14, 17, 18, 22, 25
9/5Section 1.4Homework due Thursday, 9/7: Read section 1.5, turn in exercise 5. Homework due Tuesday, 9/12: Section 1.4 problems 1, 2, 5, 8, 11, 13, 15, 17, 18, 19, 23, 24, 27, 30, 34
9/7Parametric vector equation, homogenous and non-homogenous systems of linear equationsHomework due Tuesday, 9/12: Read section 1.6. From section 1.5 turn in the following problems: 2, 6, 11, 16, 22, 23, 24
Here are some solutions to problems from section 1.2
9/12Leontief Input-Output model, Balancing Chemical equations, Review of conceptsHomework for Thursday, 9/14 Read section 1.7 and from it turn in #9. Homework due Tuesday, 9/19: Section 1.6: 4, 5
9/14Linear independenceHomework due Tuesday 9/19: Read section 2.1 and turn in problem #1. From section 1.7, turn in problems: 6, 10, 12, 15, 18, 20, 21, 22, 24, 28
Here is a supplement to the Linear Independence lecture: Lin. Indep. Supplement
9/19Matrix MultiplicationHomework due Thursday 9/21: Read section 2.2. Homework due Thursday, 9/28: Section 2.1. Turn in: 6, 12, 16, 22, 24. Practice (do not turn in): 1, 2, 3, 4, 5, 7, 9, 10, 15, 16, 19, 21, 22, 23, 25
9/21Invertible Matrices, Determinant of a 2x2 MatrixHomework due Thursday, 9/28: Read section 2.3, turn in problem 13 from that section. From section 2.2 turn in: 6, 8*, 16*, 22*, 26, 30, 32 (* means extra credit)
Here are some solutions from sections 1.4 - 1.7
9/26Theorem 8 in section 2.3, review of some homework problemsHomework due Thursday 9/28: The homework from sections 2.1 and 2.2 is to be turned in on Thursday
9/28Sections 3.1 and 3.2Homework due Tuesday 10/10: From section 3.1: 12, 18, 22, 28. From section 3.2: 4, 8, 22
10/3Section 3.3: Cramer's rule and applications, determinant as area/volume, inverses using the classical adjointHomework due Tuesday 10/10: From section 3.3: 6, 16, 22. Also, read section 4.1
10/5Exam 1. Review sheet
10/10I handed back Exam 1 along with solutions. We covered section 4.1 (definition of a vector space, subspace, examples, and Theorem 1 on page 221).Homework due Thursday, 10/12: Read section 4.2 and email me any questions that you might have about section 4.1. Homework due Tuesday, 10/17: From section 4.1, turn in: 2, 6, 16, 22
10/12Section 4.2: Null and Column spaces of matricesHomework due Tuesday, 10/17: From section 4.2 turn in 6, 10, 12, 16
10/17Section 4.3: Linearly independent sets in vector spaces, basis, related theoremsHomework due Tuesday, 10/24: From section 4.3 turn in 6, 14, 16
10/19Section 4.5: DimensionHomework due Tuesday, 10/24: From section 4.5 turn in 6, 12, 18
10/24I discussed the homework that was due on 10/17 and covered section 4.6Homework due Tuesday, 10/31: Section 4.6, 4, 10, 12, 14, 24. Bring any questions that you have for the exam.
10/26Section 5.1: Eigenvalues and Eigenvectors
10/31Review for Exam 2
11/2Exam 2The review has been posted. Follow the "Exam 2" link on the left.
11/7Sections 5.2 and 5.3. I also handed back Exam 2.Homework due Tuesday, 11/14: Section 5.1: 6, 14, 18. Section 5.2: 8, 10. Section 5.3: 2, 12, 18
11/9Section 6.1 and parts of section 6.2Homework due Tuesday, 11/28: Section 6.1: 6, 8, 12, 14, 16
11/14Section 6.2 and 6.3Homework due Tuesday, 11/28: Section 6.2: 4, 10, 14, 18. Section 6.3: 2, 4, 8, 14. Note: These aren't difficult and shouldn't take long. Ditto for 6.1 problems.
11/16Section 6.5Homework: Work through the suggested exercise problems for section 6.5
Thanksgiving vacation Nov 18 - Nov 27
11/28Section 6.6Homework: Work through problems 1-4 in section 6.6
11/30We covered homework from sections 6.1 - 6.3 and problems from section 6.6
12/5Exam 3Click the link on the left for the Exam 3 review sheet.
12/7Hand back exams, discuss the final, ICES formsPlease remember to bring a pencil.

12-12-06 1:30PM - 4:30PM

Final Exam

The final will be held in our usual classroom. Before the review sheet is up, you should use the review sheets for the three previous exams. The final is comprehensive. I will post and announce any extended office hours.
Final exam review sheetUpdate: I will have extended office hours on Monday from 12pm-2pm and again from 4pm until 6pm. Feel free to email me any questions or set up an appointment outside of those hours.