Lean
Here are some areas of mathlib that I've been involved in:
Field Theory
The primitive element theorem.
Galois theory.
Insolvability of the quintic.
Frobenius elements.
Finite Group Theory
Sylow's theorems.
Burnside's transfer theorem.
The Schur-Zassenhaus theorem.
Z-Groups.
Schreier's lemma.
Commuting probability of finite groups.
Miscellaneous
Covering spaces.
The Pontryagin dual.
Finite projective planes.
Irreducibility of x^n-x-1.
Inverse matrices over semirings.
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