Corollary 2
Tag 06G6, permanent. Cite it as [Bourbaki, Tag 06G6].
Algebra, chapter V, § 1. Prime fields. Characteristic
— For a field to be prime it is necessary and sufficient that it should contain no subfield other than itself.
Bourbaki puts the proof directly after the statement, so what is above is the statement and its proof together.
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Cites
Nothing.