Differential Equations

Math 23 Winter 2018


Instructor Seema Nanda Anne Gelb Philip Puente
Class Section 01 (Kemeny 108)
MWF 10:10 - 11:15
Section 02 (Kemeny 108)
MWF 12:50 - 1:55
Section 03 (Haldeman 028)
MWF 2:10 - 3:15
x-Hour Th 12:15 - 1:05 Tu 1:20 - 2:10 Th 1:20 - 2:10
Office 333 Kemeny Hall 207 Kemeny Hall 334 Kemeny Hall
Contact Seema.Nanda AT Dartmouth.edu Anne.E.Gelb AT Dartmouth.edu phillip.c.puente AT Dartmouth.edu
Office Hours M 3:30-4:45 pm
Tu 3:30-4:45 pm
Tu 1:20-2:10 (unless in class for x-hour);
Fr 10:30-11:30; and by appointment.
Tu 3:00-4:30pm; Th 3:00-4:30pm;
and by appointment


General Information


The course grade will be based upon on weekly homework (50 points), two midterms (75 + 125 points) and a final exam (200 points).

Violations of the Academic Honor Principle will be referred to the the Committee on Standards. In particular please be aware of rules regarding plagiarism and collusion.


There will be two in class midterm exams and an in class final exam. These will not be during the regular class times.

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:

Here are some past exams given in previous terms. Note that these are only meant as practice problems and that you should draw no conclusions about the topics, problem structure, or level of difficulty from them.

All time conflicts should be brought to the attention of your instructor as soon as you are aware of them. To ensure fairness, time conflicts will be resolved by offering the exam from 7 to 9 pm on the same day (provided you receive written permission from your instructor prior to the day of the exam).


Homework reinforces concepts and skills while challenging students to extend what they have learned to other types of problems. Because it is important for students to have this experience, instructors will not solve assigned homework problems during office hours before the due date. We will of course answer questions you may have in approaching problems that give you difficulty. It is therefore essential to begin homework sets early so that you may get help if difficulties do arise. This is especially true for problems that involve programming.

Written homework will be assigned weekly and will be posted on the homework page. It will be due each Wednesday, and is to be turned into the homework boxes outside of Kemeny 108 by 3:30 p.m. No late homework will be accepted. Homework typically covers course material through the previous Friday.

Homework grading policy: Because the goal of homework is to have students work through problems, homework grading is based on both effort and correctness based on the following 10 point scale: 85% or higher = 10; 81-85% = 9; 71-80% = 8; 61-70% = 7; 50-60% = 6; "reasonable effort" = 5; "little or no effort" = 0. Your lowest homework score will be dropped.

Please follow the homework submission guidelines.

Cooperation on homework is permitted (and encouraged), but if you work together, do not take any paper away with you--in other words, you can share your thoughts (say on a blackboard), but you have to walk away with only your understanding. In particular, you must write the solution up on your own. Please acknowledge any cooperative work at the end of each assignment.

Honor Principle

We will strictly enforce Dartmouth's Academic Honor Principle.

On Exams: Giving and/or receiving assistance during an examination violates the Academic Honor Principle.

On Homework: Collaboration is permitted and even encouraged, but it is a violation of the honor code for someone to provide the answers for you. However, assistance of any kind should be properly acknowledged.

Graduate assistant tutorials

Matt Jones (matthew.i.jones.gr AT Dartmouth.edu) will run problem solving tutorials and workshops on MATLAB on Sunday, Tuesday, and Thursday nights from 7-9pm in Kemeny 105. Please bring your questions and attend the tutorials on MATLAB. Several homework problems require using MATLAB. Instructors will not be teaching MATLAB during class time nor reviewing MATLAB during office hours.


Elementary Differential Equations and Boundary Value Problems (10th Edition) by Boyce & DiPrima, Wiley 2012

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.


Mathematics 13


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 Accessibility Services within the Academic Skills Center. The person you might want to contact at the Academic Skills center is Ward Newmeyer, Director of Student Accessibility Services 205 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.