Matroid.IsBasis.contract_sdiff_isBasis_sdiff

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

Defined in: Mathlib.Combinatorics.Matroid.Minor.Contract
Cited by: 1 results in Mathlib
Foundations: Depth 99 from the axioms · uses propext, Classical.choice, Quot.sound

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