https://leanprover-community.github.io/mathlib4_docs/Mathlib/FieldTheory/SeparableClosure.html
Mathlib.FieldTheory.SeparableClosure
mathlib
https://hiskp.uni-bonn.de/index.php?id=200&L=1
HISKP: Seminar on Effective Fieldtheory
seminareffective
https://leanprover-community.github.io/mathlib4_docs/Mathlib/FieldTheory/IsAlgClosed/AlgebraicClosure.html
Mathlib.FieldTheory.IsAlgClosed.AlgebraicClosure
mathlib