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feat(NumberTheory.NumberField.Basic): add mem_span_integralBasis (#5996)
Add the following result: ```lean theorem mem_span_integralBasis {x : K} : x ∈ Submodule.span ℤ (Set.range (integralBasis K)) ↔ x ∈ 𝓞 K ``` that is, `integralBasis` is indeed a `ℤ`-basis of the ring of integers. Co-authored-by: Riccardo Brasca <[email protected]> Co-authored-by: Riccardo Brasca <[email protected]>
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