Emil Artin
The life of Emil Artin - The Architecture of Algebra
Artin Reciprocity
A centerpiece of class field theory.
\[ \left( \frac{L/K}{\mathfrak{a}} \right) = 1 \iff \mathfrak{a} \in P_K(f) \]
Sources: https://mathshistory.st-andrews.ac.uk/Biographies/Artin/
