MATH 2400
Welcome to my bread and butter: all things introductory linear algebra and ordinary differential equations.
I’ve created a repository of notes, recitations, resources (and anything you can think of!) for the MATH 2400: Calculus III curriculum at the University of Pennsylvania, updated Fall 2025. Get a headstart on the year, review a recent recitation, or do some last minute studying!
Notes and Recitations by Week
The first step in your Linear Algebra journey!
Matrices can be tricky… but here are the tools to demystify them!
For every square matrix you need a determinant, and vector spaces are super helpful.
How we define vector spaces and their components
Making some big conclusions and starting to transform linearly!
λ: The foundation for all linear algebra
Broadening diagonalization and going in a new (orthogonal) direction…
Some interplays between symmetry, inner products, and matrices
My personal favorite part of MATH2400: differential equations!
The real reason why we teach linear algebra: real-world physical systems!
Making all these weeks come to a clash — linear algebra x diff eq collab
Reconciling when systems of diff eq’s are tough
Seeing it all play out: sketching our diff eq systems by hand!
Select Videos and Specialized Content
I’ve recorded some specialized materials that covers some more complex and theoretical concepts… with much more to come.

Final Exam Materials
Whether you’re getting a head start on finals or last-minute cramming, here’s a compilation of all previous exams from anything you can think of in MATH2400. Hope this helps, and good luck studying!
Shoot me a message!
Whatever you want to ask, I’ll try to get back to you with an answer! Whether it’s questions about MATH2400 concepts or just a desire to chat about my experience, I’m always willing to find time to chat, even as a Penn alumna 🙂
