Differential Equations

Math 23 Winter 2026

Lecture Plan

The following is a tentative schedule for the course. Please check back regularly for updates as the term progresses.

Lectures Sections in Text Description Additional comments
Monday January 5 1.1.
Begin 1.2
Basic mathematical models; Solutions of some differential equations.
Khan Academy - Differential equations intro
Khan AcademyA - Slope fields & equations
Interactive website for plotting slope fields and trajectories

Wednesday January 7 Finish 1.2.
1.3
Solutions to some problems; Classification of differential equations.
Khan Academy - Exponential model equations
Friday January 9 2.1, 2.2 Linear first order differential equations; separable equations.
Khan Academy - Separable equations
Monday January 12 2.4 Existence-uniqueness theorems.
Khan Academy -Write differential equations
Wednesday January 14 2.3 Modeling with differential equations
Khan Academy - Slope fields & solutions
Friday January 16 2.5 Autonomous equations and population dynamics
Tuesday (Wednesday) January 20 (21) 2.6 Exact equations
Wednesday (Thursday) January 21 (22) 3.1, 3.2 Second order constant coefficient equations
with distinct roots; the Wronskian
Friday January 23 3.3 Complex conjugate roots
Monday January 26 3.4 Repeated roots and reduction of order
Wednesday January 28 3.5, 3.6 Nonhomogeneous equations: Method of undetermined coefficients and variation of parameters
Friday January 30 Time and Room TBD. Exam 1 material through 3.4.
past exam practice problems
Friday January 30 7.1, 7.2 Review of matrices.
Monday February 2 7.3, 7.4 Systems of ODEs; Existence and uniqueness of solutions of systems of ODEs.
Wednesday February 4 7.5 Constant coefficients systems with distinct real eigenvalues
Friday February 6 7.6 Constant coefficient systems with complex conjugate eigenvalues
Monday February 9 7.7, 7.8 Repeated Eigenvalues
Wednesday February 11 7.9 Nonhomogeneous Linear Systems
Friday February 13 9.1 The Phase Plane (Good review!)
Monday February 16 9.2 Autonomous Systems and Stability
Plotting slope fields and trajectories
Direction field plotter

Wednesday February 18 9.3 Locally Linear Systems
Friday February 20 9.4 Competing Species
Monday February 23 9.5 Predator-Prey Equations
Wednesday February 25
Live Section 1
Review Chapter 9
Friday February 27 test 2 Material from 3.4 through 9.3. Old past exams
Friday February 27 6.1, 6.2 Laplace Transform and the IVP
Khan Academy: Laplace transform intro
Khan Academy: Properties of the Laplace transform
Khan Academy: Laplace transform to solve a differential equation
Monday March 2 6.3 Step functions
Wednesday March 4 6.4, 6.5 Discontinuous forcing functions, Impulse Functions KA: Laplace/step function differential equation
Friday March 6 6.6 The convolution integral
Khan Academy: The convolution integral
Monday March 9 Review Chapter 6 Review Chapter 6
Tuesday November 16 No class scheduled Last day of instruction
Exam Date and Time TBD Room TBD Exam covers material from the whole course. Old past exams