Matroid.IsBasis.contract_isBasis_union_union

∀ {α : Type u_1} {M : Matroid α} {I J X : Set α},
  M.IsBasis (J ∪ I) (X ∪ I) → Disjoint J I → Disjoint X I → (M.contract I).IsBasis J X

Defined in: Mathlib.Combinatorics.Matroid.Minor.Contract
Cited by: 1 results in Mathlib
Foundations: Depth 98 from the axioms · uses propext, Classical.choice, Quot.sound

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