Differential Equations

Math 23 Summer 2026

Instructor

Instructor Anne Gelb
Section 1
Class MWF 10:10 - 11:15 Room Kemeny 105
x-hour Th 12:15 - 1:05 (will not be regularly used)
Contact annegelb@math.Dartmouth.edu
Office Hours Kemeny 207: time TBD
by appointment.

Links

General Information

Please see Lecture Plan for detailed information.

Tutorials

Tutorial sessions are every Tuesday and Thursday from 7-9 pm in Kemeny 108.

Grading

The course grade will be based upon on weekly homework and attendance (5%), exam 1 (25%), exam 2 (30%), final exam (40%). The final is cumulative. You will not be permitted to have any electronic resources (cell phone, laptops, tablets) or calculators during exams. The exams will consist of true/false and multiple choice questions.

Violations of the Academic Honor Principle will be referred to the the Committee on Standards.

Exam Schedule

Attendance and Homework Policy (5%)

We will be using webwork which is available through your canvas website. It is due each Wednesday before midnight (East coast time). As all homework is posted well in advance, no late homework will be accepted. There are also some suggested problems posted on the homework page. It is highly recommended that you work through these problems as part of your exam preparation.

Homework grading policy:

Each assignment counts the same even though they may differ in number of problems. The lowest score will be dropped.

Attendance policy:

Students are permitted three absences (excused or unexcused) per term. This allowance gives you the opportunity to plan in advance for appointments, personal days, or unexpected events.To maintain fairness and accountability, any class missed after the three-day allowance will result in a 3% deduction from your overall homework grade per absence.

Grade Clarification: This deduction applies directly to your final, cumulative homework grade at the end of the term, not just the assignments for that specific week.

Maximum Cap: Attendance-related penalties will cap at a maximum total deduction of 15% from your overall homework grade.No Documentation: You do not need to submit doctor's notes or justification for any absences, as the three-day allowance accounts for these situations.

Expectations: Use your three allotted absences wisely and review the syllabus in advance to manage your time. It is your responsibility to catch up on missed material, notes, and assignments.

Textbook

Elementary Differential Equations and Boundary Value Problems (11th Edition) by Boyce & DiPrima, Wiley 2017. It is fine to use the 9th or 10th edition. The problems may differ at the end of each section, but the content is primarily the same. You may find online versions of some older editions.<\span>

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

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 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.