Corollary 1
Tag 06G5, permanent. Cite it as [Bourbaki, Tag 06G5].
Algebra, chapter V, § 1. Prime fields. Characteristic
— Let be a field. There exists a unique subfield of which is a prime field, and this is the least subfield of .
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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