Zhao Yuyang 赵雨扬
{Futian, Longgang}, Shenzhen | 深圳{福田, 龙岗}
Summary
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RockstarFR nan is a software engineer with nine years of experience who blends competitive programming roots with deep open-source work in formalized mathematics. He is an active back-end contributor to the widely used Lean math libraries (mathlib3 and mathlib4), where he refactors proofs, adds and optimizes lemmas around lists and polynomials, and helps synchronize mathlib4 with its predecessor. His contributions show an emphasis on code hygiene and typeclass design—adding ring covariance and ordered ring instances for WithBot among other refinements—reflecting strong foundations in mathematics and theoretical computer science. Ambitious to further study math and TCS, he brings a mix of algorithmic problem solving and formal-methods craftsmanship to engineering teams.
9 years of coding experience
Github Skills (14)
mathematics10
theorem-proving10
slim-410
proofs10
proof10
formal-verification10
t410
poly10
math10
leanback10
algebra10
polynomials10
type-theory9
formal-methods8
Programming languages (6)
Github contributions (5)
leanprover-community/mathlib4
Nov 2022 - Jan 2023
The math library of Lean 4
Role in this project:
Back-end Developer
Back-end DeveloperContributions:65 reviews, 37 commits, 222 PRs in 2 months
Contributions summary:Zhao primarily contributes to the math library of Lean 4, synchronizing the code with mathlib3. Their work includes modifying and extending existing mathematical definitions and theorems within files such as `Mathlib/Algebra/NeZero.lean` and `Mathlib/Algebra/GroupWithZero/Defs.lean`. The user also refactored code, fixing names and moving basic lemmas, and adding ring covariance and ordered ring typeclasses for `WithBot`.
maththeorem-provingcomputer-algebra-systemmathematicsin-progress
leanprover-community/mathlib3
Mar 2022 - Jan 2023
Lean 3's obsolete mathematical components library: please use mathlib4
Role in this project:Back-end Developer
Back-end DeveloperContributions:71 reviews, 263 commits, 145 PRs in 10 months
Contributions summary:Zhao primarily contributed to the `mathlib3` mathematical components library by adding, modifying, and deleting lemmas related to list manipulation and polynomials. They introduced lemmas and instances for list infix operations, refactored and renamed polynomial lemmas for consistency, and added new lemmas for `eval₂`. Additionally, they removed assumptions from existing lemmas, indicating a focus on code optimization and maintenance.
maththeorem-provingcomponents-librarymathematicsjavascript
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