simp only [admitsAux]
case def_
v : VarName
a✝¹ : DefName
a✝ : List VarName
binders : Finset VarName
⊢ admitsAux v v binders (def_ a✝¹ a✝)
case def_
v : VarName
a✝¹ : DefName
a✝ : List VarName
binders : Finset VarName
⊢ v ∈ a✝ ∧ v ∉ binders → v ∉ binders