case pred_const_ X xs | pred_var_ X xs | eq_ x y |def_ X xs =>
  simp
  tauto
v u : VarName
T : Finset VarName
h2 : u ∉ T
X : DefName
xs : List VarName
S : Finset VarName
h1 : v ∈ xs ∧ v ∉ S → u ∉ S
⊢ v ∈ xs ∧ v ∉ S ∪ T → u ∉ S ∪ T
no goals