split <;> rename_i h2
a : Nat
g : CNF Nat
h : mem a g
⊢ a <
    match g.maxLiteral with
    | none => 0
    | some n => n + 1
case h_1
a : Nat
g : CNF Nat
h : mem a g
x✝ : Option Nat
h2 : g.maxLiteral = none
⊢ a < 0

case h_2
a : Nat
g : CNF Nat
h : mem a g
x✝ : Option Nat
n✝ : Nat
h2 : g.maxLiteral = some n✝
⊢ a < n✝ + 1