Évariste Galois
The life of Évariste Galois - The Duelist Who Defined Algebra's Limits
Galois Group Solvability
The criterion for whether a polynomial is solvable by radicals.
\[ \text{Gal}(L/K) \text{ is a solvable group} \iff \text{Solvable by radicals} \]
Sources: https://mathshistory.st-andrews.ac.uk/Biographies/Galois/
