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THOMAS / OPEN NOTEBOOK

A place for ideas
to connect.

I'm Lu Qiyu (Thomas), a computer science student at ETH Zurich. This is my growing collection of notes, questions, and visual explanations — written to understand, shared to connect.

369Published notes

24Excalidraw drawings

2025Taking notes since

Explore the notebook

FOLLOW YOUR CURIOSITY

01 / COMPUTING↗

Computer Science

Algorithms, systems, programming, and the ideas behind the machines.

147 notes

02 / FOUNDATIONS↗

Mathematics

From discrete structures to abstract algebra: definitions, proofs, and intuition.

173 notes

03 / MARKETS↗

Finance

Financial statements, economic concepts, and how value moves.

43 notes

04 / PHYSICAL WORLD↗

Physics

Models of the physical world, from spacetime to control systems.

3 notes

Update History

• 2026-09-22 — Upgraded to Quartz v5 and added interactive Excalidraw rendering.
• 2026-05-09 — Migrated the website to Quartz v4.
• 2025-06-19 — Launched the website with Flowershow.
• 2025-05-29 — Wrote my first Obsidian note, marking the beginning of this knowledge garden.