Definition:Normal Subgroup/Historical Note
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Historical Note on Normal Subgroup
The conceptual importance of the normal subgroup was recognised by Évariste Galois.
He discussed it in the letter he wrote to his friend Auguste Chevalier the night before the duel that killed him.
Sources
- 1996: John F. Humphreys: A Course in Group Theory ... (previous) ... (next): Chapter $7$: Normal subgroups and quotient groups: Summary