Differential Equations

Math 23 Winter 2020


Instructor Anne Gelb Laura Petto
Class Section 02 Kemeny 006
MWF 2:10 - 3:15
Section 01 Kemeny 006
MWF 12:50-1:55
x-Hour Th 1:20- 2:10 T 1:20 - 2:10
Office 207 Kemeny Hall 214 Kemeny Hall
Contact annegelb AT math.Dartmouth.edu LauraRPetto AT math.Dartmouth.edu
Office Hours Monday 10:15-11:15; Friday 10:15-11:15;
by appointment
Monday 11:00-12:15; Friday 2:00-3:30;
by appointment


General Information


The course grade will be based upon on weekly homework (10%), two midterms (25% each), a final exam (35%), and class participation (5%).

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. Please note that these are only meant as practice problems. You should not draw any conclusions about the topics, problem structure, or level of difficulty from them. Working the problems at the end of each section and carefully reviewing your class notes is a great way to prepare for exams.

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.

Written homework is assigned weekly and posted on the homework page. It is due each Tuesday. Please place your homework in the homework boxes outside of Kemeny 108 by 6:30 p.m. As all homework is posted well in advance, 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.

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 and office hours

Grant Molnar (Grant.S.Molnar.GR AT dartmouth.edu) will run problem solving tutorials on Monday (7:00-9:00 pm) and Thursday (7:00-9:00 pm) in location Kemeny 108. Grant will also be holding office hours on Tuesday from 4:00-5:00 pm and Wednesday from 10:00-11:00 am in Kemeny 245.


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. Please note that Section 1 will not meet on Wednesday September 19 but instead will be holding X hour that week.