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feat(ring_theory/ideal): generalize
x mod I ∈ J mod I ↔ x ∈ J
(#13358)
We already had a lemma like this assuming `I ≤ J`, and we can drop the assumption if we instead change the RHS to `x ∈ J \sup I`. This also golfs the proof of the original `mem_quotient_iff_mem`.
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