Teaching

Mathematics at the board and online

I enjoy making abstract mathematics concrete through calculation, diagrams, careful pacing, and discussion.

f′(x) = limh→0 [f(x+h) − f(x)] / h
University of Washington

Math 124 — Differential Calculus

Teaching experience in the first course of the single-variable calculus sequence, including limits, derivatives, linear approximation, and applications of differentiation.

The Method of Infinitesimal Analysis is an accompanying expository writing connected with this course.

ab f(x) dx
University of Washington

Math 125 — Integral Calculus

Teaching experience in the second course of the single-variable calculus sequence, including definite and indefinite integrals, the Fundamental Theorem of Calculus, techniques of integration, and applications.

Two Trigonometric Integrals is an accompanying expository writing connected with this course.

A𝐱 = 𝐛
University of Washington

Math 208 — Matrix Algebra

Teaching experience with matrices, systems of linear equations, linear transformations, determinants, eigenvalues, and the algebraic structure underlying finite-dimensional linear systems.

Online mathematics

A long-running archive of short lectures and informal mathematical exploration.

Fraljimetry
mathematics in short form
Bilibili

Undergraduate and graduate mathematics videos

I have published more than 2,000 videos organized into over 20 albums, covering course material, mathematical ideas, and research-oriented study. The channel has reached more than 25,000 followers and one million views.

Teaching philosophy

I want students to see the mathematical object before they become buried in notation. Pictures, explicit computations, and carefully chosen examples can reveal the structure behind a definition without sacrificing rigor.

My goal is to help students move between three views of a problem: geometric intuition, symbolic calculation, and proof.

Course materials: Public notes and selected expository writing will be added to the Notes page as they are prepared for wider use.