simp only [admitsAux]
case def_
v u : VarName
a✝¹ : DefName
a✝ : List VarName
binders : Finset VarName
h1 : v ∈ binders
⊢ admitsAux v u binders (def_ a✝¹ a✝)
case def_
v u : VarName
a✝¹ : DefName
a✝ : List VarName
binders : Finset VarName
h1 : v ∈ binders
⊢ v ∈ a✝ ∧ v ∉ binders → u ∉ binders