exact h'
ι : Type u_1
α : Type u_2
M : Matroid α
B I J X X' Y Y' F : Set α
Xs Ys Js Is : ι → Set α
i j : ι
e f : α
h : M.Skew X Y
h' : M.SkewFamily fun i => bif i then M.cl X else M.cl Y
⊢ M.Skew (M.cl X) (M.cl Y)
no goals