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Theorem 7b of Serre's "Propriétés galoisiennes des points d'ordre fini des courbes elliptiques"

Could someone please point me towards a proof of the statement in the second paragraph, in the proof of Theorem 7b of Serre's Propriétés galoisiennes...? The statement is as follows: Let $F$ and $F'$ …
Bob G's user avatar
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