cases h <;> rename_i h
l : Nat
c : Clause Nat
h : (l, false) ∈ c ∨ (l, true) ∈ c
⊢ ∃ maxLit, c.maxLiteral = some maxLit
case inl
l : Nat
c : Clause Nat
h : (l, false) ∈ c
⊢ ∃ maxLit, c.maxLiteral = some maxLit

case inr
l : Nat
c : Clause Nat
h : (l, true) ∈ c
⊢ ∃ maxLit, c.maxLiteral = some maxLit