Teaching

Mathematics at the board and online

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

\[\frac{\mathrm{d}y}{\mathrm{d}x}\]
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.

Course materials

This collection can expand independently as additional writings and handouts are added.

PDF
Where Do Complex Numbers Come From?

September 2025 · 3 pages

PDF
The Method of Infinitesimal Analysis

Selected writing for Math 124

\[\int f(x)\,\mathrm{d}x\]
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.

Course materials

New notes can be added as separate cards without resizing the course cover.

PDF
Two Trigonometric Integrals

Selected writing for Math 125

\[A\mathbf{x}=\mathbf{b}\]
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.

Course materials

Notes and handouts will appear here as individual cards.

No public files yet.

Online mathematics

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

Bilibili

Undergraduate and graduate mathematics videos

I have published around 3,000 videos organized into more than 50 albums, covering course material, mathematical ideas, and research-oriented study. The channel has more than 30,000 followers.

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 continue to be added here as they are prepared for wider use.