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Name: Duo Cao
Office: MATH 433
Office Hour: Wednesday 2-4pm at MATH 433 or by appointment
E-mail: cao157@purdue.edu



Teaching
Fall 2015, MA261 Multivariate Calculus
Fall 2017, MA261 Multivariate Calculus
Spring 2018, MA262 Differential Equations and Linear Algebra
Fall 2019, MA261 Multivariate Calculus
Spring 2020, MA262 Differential Equations and Linear Algebra



Hand-written homework due on Feb 21st: Homework 12-13

Handwritten Homework 1-- Sect. 1.2 #3, 18. Sect. 1.3 # 1,2 (Offline)
Handwritten Homework 2-- Sect. 2.2 #31, 34 (Offline)
Handwritten Homework 3-- Sect. 2.3 #23, 25(a), 30 (Offline)
Handwritten Homework 4-- Sect. 2.4 #15, 29 (Offline)
Handwritten Homework 5-- Sect. 2.6 #44, 46
Handwritten Homework 6-- Sect. 3.4 #25. (Offline)
Handwritten Homework 7-- Sect. 7.1 #28,30. Sect. 72.#23,31
Handwritten Homework 8-- Sect. 7.3 #28. Sect. 7.4 #36 (Offline)
Handwritten Homework 9-- Sect. 7.5 #38. Sect. 7.7 #14, 40
Handwritten Homework 10-- Sect. 7.8 #23. Sect. 7.9 # 12 (Offline)
Handwritten Homework 11-- Sect. 8.1 # 11, 15 (Offline)
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Due
Handwritten Homework 12- Sect. 8.2 # 38 (Offline)
Handwritten Homework 13-- Sect. 9.1 # 3,10. Sect. 9.2. # 29 (Offline)

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Handwritten Homework 14-- Set. 9.3 # 32 (Offline)
Handwritten Homework 15-- Sect. 10.1 # 33 (Offline)
Handwritten Homework 16-- Sect. 10.2 # 30 (Offline)
Handwritten Homework 17-- Sect. 10.3 # 22, 23 (Offline)
Handwritten Homework 18- Sect. 10.5 #20, 27 (Offline)
Handwritten Homework 19-- Sect. 10.6 #16, 23 (Offline)
Handwritten Homework 20-- Sect. 11.1 # 23, 24 (Offline)
Handwritten Homework 21-- Sect.11.2 # 25 (Offline)
Handwritten Homework 22-- Sect. 11.5 # 24 (Offline)
Handwritten Homework 23-- Sect. 4.2 # 34 (Offline)
Handwritten Homework 24-- Sect. 4.3 #33 (Offline)
Handwritten Homework 25-- Sect. 4.4 # 35, 36 (Offline)
Handwritten Homework 26-- Sect. 4.5 #41 (Offline)
Handwritten Homework 27-- Sect. 4.6 # 20, 22 (Offline)
Handwritten Homework 28-- Sect. 4.7 #37, 41 (Offline)
Handwritten Homework 29-- Sect. 4.9 # 15 (Offline)
Handwritten Homework 30-- Sect. 5.1 #24, 27 (Offline)
Handwritten Homework 31-- Sect. 5.2 #20, 21 (Offline)
Handwritten Homework 32-- Sect. 5.3 #33 (Offline)
Handwritten Homework 33-- Sect. 6.4 #29, 30 (Offline)
Handwritten Homework 34-- Sect. 6.5 #37 (Offline)
Handwritten Homework 35-- Sect 6.6 #21 (Offline)
Handwritten Homework 36-- Sect. 6.7 #33 (Offline)

Hand-written homework partial solutions (Let me know if you need solutions of other problems):

week1

week2
I made a mistake for 7.5 #38. Answer should be no. In both case, A has at most 2 pivot columns.

week3 (none)



Quiz solutions:
quiz1

quiz2

quiz3
quiz4

Next week quiz content (Feb 21st):
1. Solve a linear ODE
2. Discuss linear system solutions