Theorem: Matroid.Basis.rFin_of_finite (Matroid/Rank.lean)

State before:
α : Type u_1
ι : Type u_2
M N : Matroid α
I B X X' Y Y' Z R : Set α
n : ℕ∞
e f : α
hIX : M.Basis I X
h : I.Finite
⊢ M.rFin X
Tactic:
rwa [← er_ne_top_iff, ← hIX.encard, encard_ne_top_iff]
State after:
no goals