exact Or.inl $ Or.inl hf
case inl
n : Nat
f : DefaultFormula n
c : DefaultClause n
f_readyForRupAdd : f.readyForRupAdd
x✝ : Option (Literal (PosFin n))
l : PosFin n
hc : c.isUnit = some (l, true)
hsize : (f.assignments.modify l.val addPosAssignment).size = n
i : PosFin n
b : Bool
hb : hasAssignment b (f.assignments.modify l.val addPosAssignment)[i.val] = true
i_in_bounds : i.val < f.assignments.size
l_in_bounds : l.val < f.assignments.size
ib_ne_c : ¬(i, b) = (l, true)
hb' : hasAssignment b f.assignments[i.val] = true
hf : some (unit (i, b)) ∈ f.clauses.data
⊢ (some (unit (i, b)) ∈ f.clauses.data ∨ unit (i, b) = c) ∨
    (∃ a,
        (a, false) ∈ f.rupUnits.data ∧ unit (a, false) = unit (i, b) ∨
          (a, true) ∈ f.rupUnits.data ∧ unit (a, true) = unit (i, b)) ∨
      ∃ a,
        (a, false) ∈ f.ratUnits.data ∧ unit (a, false) = unit (i, b) ∨
          (a, true) ∈ f.ratUnits.data ∧ unit (a, true) = unit (i, b)
no goals