Course Chair:Hongkun Zhang, hongkun@math.umass.edu. This page will be updated periodically if rooms change. Definitive information can be found via SPIRE or from the department's course webpage.
Class Number  Section  Instructor  Location  Meeting Time 
30261  331.1  Garret Cahill  MWF 11:15 AM12:05AM  
30262  331.2  Siddhant Govardhan Agrawal  TuTh 1:00 PM2:15PM  
30263  331.3  Garret Cahill 

MWF 12:20 PM 1:10PM 
30325  331.4  Weimin Chen  MWF 1:25PM2:15PM  
30364  331.5  Hongkun Zhang  TuTh 11:30AM12:45PM  
30377  331.6  Not run  
30387  331.7  Hongkun Zhang  TuTh 10:00 AM11:15AM  
Teaching Assistants
The course TA's will hold office hours that are open to students from all sections of math 331 each week throughout the semester. Office hours will be held in LGRT?, not in the TAs' regular office. The TA's list and office hours post here,
Monday: Richard Buckman 45pm, LingChen Bu 56pm
Tuesday: Richard Buckman 46pm
Wednesday:Yaping Yuan 46pm
Thursday: LingChen Bu 46pm
TAs will run the office hours start from second week of the semester.
Description
Introduction to ordinary differential equations.First and second order linear differential equations, systems of linear differential equations, Laplace transform, numerical methods, applications. If you already passed math131, math132, then you are eligible to register math331.
Textbook
Elementary Differential Equations, 11th Edition (2017) by William E. Boyce, Richard C. DiPrima, Douglas B. Meade
Text and online homework: We will use the textbook Elementary Differential Equations, 11th Edition (2017) by William E. Boyce, Richard C. DiPrima, Douglas B. Meade. An electronic copy of the textbook is integrated in the homework system WileyPlus that we will use for the class. When settingup your account with Wiley plus there will be an option to purchase a hard copy of the book for a (small) extrafee.
There is no required calculator for the course, although many students find them helpful for homework. You will NOT be allowed to use a calculator on exams , you must show all work other than arithmetic calculations. I recommend you to buy TI89 calculator if you don't have one.
Grading
The grading of the course will be as follows. There will be a final exam worth 30%, Midterm during the semester worth 30%, Homework worth 30%, written homework and Pop quizzes worth 10% All scores will be scaled to a 0100 scale before averaging.
The final will be cumulative, with some emphasis placed on topics covered after the first exam. The date and time of the final exam will be scheduled by the university. The final will only be given at that time, and not at any other time for any reason. In particular, adjust your travel plans accordingly; planning to leave for vacation before the final exam is a bad idea.
Exam policies:
The following is meant to give a general idea of which sections are covered in which weeks. Coverage may be different depending on such factors as MWF vs. TuTh schedule, different paces of individual instructors, etc. However, it is expected that all these sections will be covered.
Week  Lecture  Event 
9/3  Introduce course policy, 1.1, 1.2  The first class starts on Tuesday 9/3 
9/9  1.3 Introduction; 2.1 Linear ODEs 

9/16 
2.3 Modelling with ODEs 2.5 Autonomous equations 
Monday 9/16 last day to add/drop 
9/23  2.4, 2.7, and 2.8 Theory and Euler methods 2.6 Exact equations 

9/30  3.1 2nd order equations with constant coefficients 3.2 Wronskian 

10/7  3.3 Complex roots 3.4 Repeated roots 

10/14  3.5 Nonhomogeneous ODEs  Midterm is on Thursday 10/17, 79pm, Midterm covers 1.13.2 Monday is holiday, Tuesday is Monday schedule.Makeup Exam is on Friday 10/18,79pm 
10/21  3.7 Mechanical and Electrical oscillations 3.8 Forced oscillations 

10/28  6.1 Laplace transform 6.2 Initial value problems 
Tuesday 10/29 is last day drop with "W" 
11/4  6.3 Step functions
6.4 Discontinuous forcing 

11/11  6.5 Impulse functions
7.1 Introduction to systems 
Monday is Holiday; Wednesday=Monday 
11/18  7.27.3 Matrices 

12/2  7.5 Real eigenvalues 

12/9  Review 
Wendnesday 12/11 is last day of classes 
12/?  Final Exam 
Final exam 12/12 
12/16  Grades  Final Grade is due by 12/16 
Math331 Handwritten Homework
2. Step and Impulse Functions Homework
The best way to get help is to visit TA'S office hours: 46pm Monday to Thursday.
Drops, Withdrawals, and Incompletes
The last day to drop with no record, or to submit a Pass/Fail option, is Monday, September 16th. If you intend to drop, please do so as soon as possible; others may be waiting to enroll in your section. The last day to drop with a W is the midsemester date, Tuesday, Octorber 29.
An Incomplete is possible only if: (1) you had a compelling personal reason, e.g., serious illness; (2) your work has clearly been passing; and (3) there's a good chance you'll complete the course with a passing grade within the allotted time. Thus, failing work is no reason in itself for an Incomplete.