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feat({field,ring}_theory/adjoin): generalize
induction_on_adjoin
(#…
…4647) We can prove `induction_on_adjoin` for both `algebra.adjoin` and `intermediate_field.adjoin` in a very similar way, if we add a couple of small lemmas. The extra lemmas I introduced for `algebra.adjoin` shorten the proof of `intermediate_field.adjoin` noticeably.
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