Differential Equations

Math 23 Fall 2020


Instructor Anne Gelb
Section 2
Jan Glaubitz
Section 1
Class Remote learning
MWF 8:55 - 10:00
Remote learning
MWF 2:35-3:40
x-hour Th 9:10- 10:00 Th 1:40 - 2:30
Contact annegelb@math.Dartmouth.edu Jan.Glaubitz@Dartmouth.edu
Class Discussions Wednesday 8:55-10:00 Monday 2:35-3:40
Office Hours Th 9:10-10:00 (x-hour); Monday 7pm-8pm;
by appointment.
Th 1:40-2:30 (x-hour); Tu 8am-9am;
by appointment.


General Information

Structure for remote learning. Please see Lecture Plan for detailed information.

Synchronous lectures

All students have the option of attending synchronous lectures on Monday 8:55-10:00 and Wednesday at 2:35-3:40. The zoom links will be provided on CANVAS under the SYLLABUS link. On Fridays during class time we will have group meetings.

Asynchronous lectures

Each week there will be three recorded lectures made available on CANVAS: The Monday and Wednesday zoom lectures and a third lecture on Friday. Friday's class time group meetings will not be recorded.

Synchronous class discussion

All students are invited to participate in class discussions. These will be held on Mondays 2:35-3:40 and Wednesdays 8:55-10:00. Zoom links will be provided on CANVAS under the SYLLABUS link. Class discussions will not be recorded.

Math 23 tutorial sessions

Tutorials will be run by Kathy Lin (email: Yixin.Lin.GR@dartmouth.edu) on Sunday, Tuesday and Thursday nights from 7pm-9pm (Eastern). Zoom links will be provided on CANVAS under the SYLLABUS link. Tutorials will not be recorded.


The course grade will be based upon on weekly homework (total 100 points), exam 1 (100 points), exam 2 (150 points), exam 3 (200 points), and weekly group assignments (total 50 points). Total points possible: 600. The exams will be given remotely. They will be time limited. Students will not be allowed to access books, notes, or any other outside material.

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.


Here are some past exams given in previous terms. Please note that these are only meant to be used 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.

Homework 100 points

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 before midnight (East coast time). We will be using webwork . 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: The goal of homework is to learn to work through problems. Therefore each problem set will be assigned a grade on a 10 point scale based on the following percentage of correct results as submitted through webwork: 85% or higher = 10; 81-85% = 9; 71-80% = 8; 61-70% = 7; 50-60% = 6; 30-49% = 5; 20-29% = 3; 10-19% = 2; 5-9% = 1; below 5% = 0. The lowest homework score will be dropped, and the combination of the remaining scores will be scaled according to the 100 point grading scheme.

Group Assignments 50 points

Every Friday starting week 2, each group of students (to be determined in the first week through CANVAS) will meet during the allotted 15 minute time with their instructor to present the group assignments. The groups will meet prior to the group/instructor meeting to work through the group assignment. Each member of the group is ultimately responsible for one of the group problems.

Grading for group assignments: A score between 1-5 will be assigned to the entire group for each meeting. The lowest score will be dropped. At the end of the term the remaining scores will be scaled according to the 50 point grading scheme.

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 both permitted and encouraged, but it is a violation of the honor code for someone to provide the answers for you.


Elementary Differential Equations and Boundary Value Problems (11th Edition) by Boyce & DiPrima, Wiley 2017. Note that it is ok to use the 10th edition.

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 2 will not meet on Monday September 28. Students may attend the live lecture given at 2:35 (Section 1).