Another Correction!
Homework 10, Section 5.4 #33. The generalized eigenvector v_2 is wrong. It should be v_2=[1 i 1 i]^T. Using this v_2 will give the v_1 in the book. This problem was already assigned as part of assignment 11, so there is no need to turn it in with assignment 10.

Sample Exams


Sample Exam 1
Answer Key for Sample Exam 1
Sample Exam 2
Answer Key for Sample Exam 2
Sample Exam 3
Answer Key for Sample Exam 3

Instructors


• Xiang Tang, Cupples I, 112B, xtang@math.wustl.edu
• Kabe Moen,  Cupples I, 202, moen@math.wustl.edu

Teaching Assistant


• Joshua Brady,  Cupples I, 6, jbrady@math.wustl.edu
  

Text 


• Edwards and Penny, "Differential Equations and Boundary Value Problems, Computing and Modeling", 4th edition. We plan to cover Chapters 1 to 9 of the book.
  

Review Session


• There will be weekly review sessions every Tuesday 4:00-5:30p.m. and Wednesday 3:00-4:30p.m. held by our TA. Review sessions are optional, but will be helpful to those with  questions about lectures and homework problems. The review sessions will be held in Brown 118. The review sessions will start Wednesday September 9th, so there will be no review session on Tuesday September 8th!
  

Office Hours 





Xiang Tang	T: 10-11, W: 4-5	Cupples I, 112 B
Kabe Moen	T: 12-1, Th: 12-1	Cupples I, 202
Joshua Brady	M: 2-3	Cupples I, 6


Course Webpage


• http://www.math.wustl.edu/~jbrady/fall2009-diffeq.htm
  


Prerequisite


• Math 233 (Calculus III), or Math 233 concurrently
  

Lectures


• You are strongly suggested to attend the lectures. No talk, food and drinking is allowed in class. Please close your cell phone or change it to ``silent".  Information about materials covered and homework assigned each lecture will be updated on the course website.


Homework


• You will have graded homework turned in every Thursday at the beginning of Thursday's lecture.  Late homework will not be accepted! The homework collected is to be considered a bare minimum of homework that you should do. "A" students will generally do nearly every problem in the exercise sections.

• Put the following information at the top left corner of each page of your homework: full name, student ID, and the due dates. Your turned in homework will be graded on several factors including accuracy and neatness. It is your responsibility to make sure the grader can understand your work.

• Homework is graded according to the following distribution. Total score of a homework  is 20. 4 out 20 is graded according to the amount of work being completed. And the left 16 out of 20 is graded according to the accuracy. We will choose to grade 4 problems in each assignment, and each problem counts 4 points.
  

Exams


• There will be three midterms and one final. The following is the schedule

Exam 1	September 22	6:30-8:30p.m.
Exam 2	October  20	6:30-8:30p.m.
Exam 3	November 17	6:30-8:30p.m.
Final	December 11	3:30-5:30p.m.



• Exams will consist of a number of multiple choice questions, whose answers you will mark on an answer card for reading by a scanning machine. A portion of each evening exam will consist of a free-response, lovingly hand-graded question, for which partial credit will be given. It is considered your responsibility to make your work clear and legible. If the grader is unable to easily find your answer and understand your work, you will miss points. (The final exam will consist entirely of multiple choice questions.
• Exam rooms will be assigned before each test. You can look up your room at Exam seat lookup .
• Exam Materials You should bring the following equipment to each exam:
• Your Washington U photo ID card
• Several pencils (with erasers)
• An approved scientific calculator
• 3x5 note card with any helpful notes you care to make.

Please do not bring the following with you to your exam:

• Notes other than the 3x5 card
• Scratch paper (there is plenty of room to write on the test booklet)
• Non-approved calculators
• After multiple choice portion of the exam has been graded (usually the next day), there will be a limited period of time during which you can look at the papers in the Math office to raise questions about mismarked cards and similar issues. After this holding period your exams will be returned to you (possibly in the hallway in Cupples I). The day after the exam (usually between noon and 4PM), scores for the multiple choice portion of the exam can be found here: Exam Scores Exam grades (with the handgraded grades) can be looked up on Telesis .
  



Grading scale 


• Homework: 20%, Mid1: 20%, Mid2: 20%, Mid3: 20%, Final: 20%. The grades are assigned according the percentage you are in the class.
• The exam dates (including the final) were set by the College office before you registered for this class. You are therefore expected to take the exams at their scheduled times. If you are away because of a university sporting event or field trip, then you may arrange for your coach or professor to administer the exam. Excused absences may be granted in the case of illness or bereavement. All excused absences must be granted by Professor Shapiro. The final exam date cannot be changed for reasons of traveling convenience.
• Letter grades will be given based on your overall score. The cutoffs for the various letter grades will be no higher than the following:

A	90
B	75
C	60
D	50




• In total, we will collect 13 homework. You are allowed to drop the two lowest homework score.
• The score of the final test can be used to replace the lowest midterm exam score. 
  

Calculator


• You may use any standard graphing or scientific calculator on the exams.   Be sure the calculator you choose can handle logarithmic, exponential, and trigonometric calculations.  It would be wise to use this calculator when you work your homework problems so you will be comfortable with it when you take the exams.

 

 Homework assignments

 
Week 1(due 9/10) 1.1 #28; 1.2 #26, 38, 39; 1.3 #3, 6, 27; 1.4 #12, 25, 64.

 
Week 2(due 9/17) 1.4 #14, 18, 34, 49; 1.5 #7, 22, 24, 30, 33, 38.

 
Week 3(due 9/24) 1.6 #2, 8, 23, 31, 37; 2.1 #5, 9, 18; 2.2 #10, 21.

 
Week 4(due 10/1) 2.2 #23, 24; 2.3 #1, 2, 7, 25, 26; 2.4 #2, 5, 9

 
Week 5(due 10/8) 2.5 #3,5; 3.1 #2, 10, 20, 21, 32, 33, 36, 40.

 
Week 6(due 10/15) 3.2 #4, 12, 24, 30 3.3 #5, 9, 12, 18, 23, 33;

 
Week 7(due 10/22) 3.4 #3, 4, 8, 13; 3.5 #7, 10, 18, 28, 33, 39;

 
Week 8(due 10/29) 3.5 #52, 55, 57, 59, 60; 3.6 #2, 6, 7, 15, 24
Correction for problem 60! The complimentary solution given is incorrect, the correct complimentary solution is y_c=C_1 x^{1/2}+C_2 x^{3/2}. Using this complimentary solution will give the correct answer.

Week 9(due 11/5) 4.1 #3, 4, 15, 18, 24, 25; 5.1 #3, 4, 9, 12

Week 10(due 11/12) 5.2 #2,6,15,26,29; 5.4 #2, 9,15, 24, 33

Week 11(due 11/19) 5.4 #25, 26, 28, 33; 5.6 #1, 5, 8, 17, 19, 21

Week 12(due 12/3) 7.1 #6, 19, 20, 29; 7.2 #7, 15, 20; 7.3 #3, 16, 30