Math 23

Differential Equations

General Information



Textbook: “Elementary differential equations and boundary value problems” 9-th edition , by W. Boyce and R. DiPrima  available at Wheelock Books



ORC Course description: This course is a survey of important types of differential equations, both linear and nonlinear. Topics include the study of systems of ordinary differential equations using eigenvectors and eigenvalues, numerical solutions of first and second order equations and of systems, and the solution of elementary partial differential equations using Fourier series.

Prerequisite: Mathematics 13.




Scheduled Lectures and Instructors:


Vladimir Chernov

Rustam Sadykov

Classes: MWF 12:30-1:35 PM

(x-hour) Tu 1-1:50 PM

Classes: TuTh 10:00-11:50 AM

(x-hour) W 3-3:50 PM

Class location: 008 Kemeny

Class location: 006 Kemeny

Tentative Office hours: Monday 3:30-5 PM,

Tuesday 3:30-5 PM, Friday 4-5 PM

and by appointment

Tentative Office hours: Monday 3-5 PM,

Thursday 5-6 PM, Friday 4-5 PM

and by appointment

Office: 304 Kemeny Hall

Phone number 646 2421,

blitz (preferred)

Office: 316 Kemeny Hall

Phone number 646 2960

blitz (preferred)

Information for the section taught by Chernov


Information for the section taught by Sadykov





Course Grade will be based upon the scores on the scores for Homework, Midterm Exams, and the Final Exam as follows:


 Written Homework


Two Midterm Exams

25% each (50% total)

Final Exam

35 %




Exams: There will be two in-class "midterm examinations" and an in-class final examination. These will not be during the regular class times. The Midterms will be 6-8 PM   Tuesday April 21 in Carpenter 013  and 6-8 PM Wednesday May 13 in Carpenter 013. The place and time of the final exam is scheduled by the registrar and it is 3-6 PM on Friday June 5 in Moore Filene.


Do not make plans to leave Hanover before the end of the final exam week. The exams will not be given earlier to accommodate your travel plans. The exams are scheduled as follows:



1st  Midterm Exam

6-8 PM   Tuesday April 21 in  Carpenter 013

2nd Midterm Exam 

6-8 PM Wednesday May 13 in Carpenter 013

Final Exam

3-6 PM on Friday June 5 in Moore Filene




Written Homework: will be assigned after each lecture. Since one section of the course is taught on MWF and the other on TuTh it is not possible to assign the exact same homework after each lecture. However we will do our best so that the combined sets of all homework problems that were assigned to the two sections over the whole term are the same. The graders will be instructed to follow the same rules when grading the homeworks for the two section.


The Written homework and the due dates for Chernov’s section can be found here;


The Written homework and the due dates for Sadykov’s section can be found here;


Late homework will not be accepted. If you feel there is a very legitimate reason for your homework to be late you should discuss this with the Instructor to your section in advance. Unexcused and missing papers count zero. The homework assignment for which the score is the lowest will be dropped when computing the total grade.


Tutorials for the class are 7-9 PM on Tuesdays, Thursdays and Sundays in Kemeny 006. They will be run by the Graduate Student Teaching Assistant Avram Gottschlich. Please note that the students in the previous years found these tutorials to be very helpful!


Honors Principle:

·       On Exams: No help given or received.

·       On Homework: Collaboration on homework is allowed and encouraged but no copying!

·       In general: when in doubt ask before doing.


Disabilities: Students with learning, physical, or psychiatric disabilities enrolled in this course that may need disability-related classroom accommodations are encouraged to make an office appointment to see your instructor before the end of the second week of the term. All discussions will remain confidential, although the Student Accessibility Services office may be consulted to discuss appropriate implementation of any accommodation requested. At such a meeting please provide your instructor with a copy of a disability registration form, which lists the accommodations recommended for the student by Student Disability Services within the Academic Skills Center The person you might want to contact at the Academic Skills center is Ward Newmeyer, Interim Director of Student Accessibility Services 301 Collis Center - (603) 646-9900.

Student Religious Observances: Some students may wish to take part in religious observances that fall during this academic term.  Should you have a religious observance that conflicts with your participation in the course, please come speak with your instructor before the end of the second week of the term to discuss appropriate accommodations.