Yaël Dillies
Stockholm, Stockholm County, Sweden
Summary
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RockstarYaël Dillies is a PhD candidate in additive combinatorics at Stockholm University with four years of software development and proof-engineering experience. He is an active contributor to the Lean community, notably mathlib4 and mathlib3, where he formalizes mathematical definitions and theorems and refines APIs in order theory, group theory, and set operations. Yaël bridges deep mathematical reasoning with backend proof-library work, integrating new concepts into a widely used foundation for machine-checked mathematics. His attention to precise lemmas and API tweaks quietly strengthens the reuse and robustness of formalized mathematics.
4 years of coding experience
Github Skills (17)
mathematics10
math10
maths10
formal-verification10
theorem-proving10
slim-410
t410
leanback10
logic10
algebra9
abstract-algebra9
category-theory9
ordered8
ordered-set8
cgroup7
Programming languages (9)
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:5857 reviews, 41 commits, 1248 PRs in 2 months
Contributions summary:Yaël primarily contributed to the `mathlib4` repository by implementing and refining mathematical definitions and theorems within the Lean 4 language. Their commits focused on adding new mathematical concepts, such as functions, order theory, and group theory. They frequently matched their contributions to existing mathlib pull requests, indicating a focus on integrating their work into the broader mathematical library. This suggests a role involving core mathematical formalization and library development.
maththeorem-provingcomputer-algebra-systemmathematicsin-progress
leanprover-community/mathlib3
Mar 2021 - Jan 2023
Lean 3's obsolete mathematical components library: please use mathlib4
Role in this project:Back-end Developer
Back-end DeveloperContributions:3216 reviews, 2057 commits, 987 PRs in 1 year 10 months
Contributions summary:Yaël contributed to the mathlib3 repository by adding several lemmas for the `order/hom` and `data/set/basic` modules. The commits focused on defining and proving laws for equivalence mapping morphisms to their duals as well as extending existing APIs. Furthermore, the user introduced lemmas related to n-ary images and improvements for `set.image2` API, showcasing a focus on core mathematical structures within the Lean framework.
maththeorem-provingcomponents-librarymathematicsjavascript
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