College Homepage Math Department Course Homepage Syllabus Reading assignments Problem sets College calendar Timetable diagram Announcements Course Calendar Questions/Answers Tutorial sessions 
AnnouncementsDec. 2, 2pm Final examination classroom assignments have been posted here.
Oct. 24, 7pm Some of you suggested that each time I post reading assignment for the whole week before Monday. I think that it is a good idea and I will try to do it in future (see Reading Assignment for the next week). Oct. 24, 7pm I posted a few more answers to your questions. Oct. 24, 7pm Next week we will go over series solutions (Chapter 5). I plan that we spend only 23 lectures on Chapter 5, so the pace may be fast. If you need a review of power series, you may want to look through section 5.1 in advance. Oct. 24, 7pm Note that at the back of the textbook there are answers to almost all problems. You may want to verify your answers when you do your HW and I encourage you to do so. Oct. 21, 9pm Quiz 2 will cover problems from L7L12. All problems will be similar to those we discussed in class. It is very important that you review how to solve homogeneous linear equations in all cases that arise; namely the cases of single and repeated roots, real and complex roots. It is also very important that you review the forms of particular solutions of nonhomogeneous equations (either L10, page 5; or textbook Table 3.6.1). Oct. 21, 9pm Today I received many questions. I am posting answers to some questions. Hope it will be helpful. Oct. 18, 2am Some of you asked me about the average for Quiz 1. It is 38/43. You may want to read through and think over suggestions of your fellow students (thanks a lot to everyone who shared his/her experience!). Oct. 17, 5pm Thanks a lot for your comments and suggestions. It seems that most of you did like to have practice time during lectures so we will continue to do so. I will also continue to distribute lecture notes till the end of the term. Oct. 7, 11am These days I received many questions. I put answers to a few of them for everyone on Q/A page. Sept. 30, 3pm On
Wednesday we will discuss Theorem 2.6.1 on exact equations. The proof
of the theorem is somewhat involved. Because of that I strongly
recommend that you read the proof before the lecture.
Sept. 30, 3pm Some of you asked me questions
that I think might be interesting to others as well. You may find these
questions and answers here.
Sept. 29, 3pm As has been announced in class,
today I have extended OH, from 3pm till 6 pm. Tomorrow my office hours
are from 4pm till 6pm. Besides, tomorrow we have a tutorial session
from 6pm till 8pm (meet Patricia Cahn in her office, Kemeny Hall, room
243). Schedule and location of future tutorial sessions can be found here.
Sept. 25, 8pm Problems for L2 have been posted here. Sept. 25, 3pm There
was a misprint on the Syllabus page. The Midterm is scheduled on
November 5, not October 29. The information on the Course Calendar page
was correct.
Sept. 18, 3pm This course is standard. For a tentative schedule and topics you may browse through websites of M23 lectured in previous years, e.g, this one. Sept. 18, 3pm The first class will be on Wednesday, Sept. 24, 10:0011:05. Sept. 18, 3pm
Welcome to the website of the course M23, Differential
equations. Now the website is still under construction and, in
particular, some of its content can be modified before Fall term
classes begin.
