simp only [hasAssignment, b_eq_false, l_eq_i, Array.get_modify_at_idx i_in_bounds, ite_false, hasNeg_of_addPos] at hb
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
hf : hasAssignment b f.assignments[i.val] = true → unit (i, b) ∈ f.toList
i_in_bounds : i.val < f.assignments.size
l_in_bounds : l.val < f.assignments.size
ib_ne_c : ¬(i, b) = (l, true)
l_eq_i : l.val = i.val
b_eq_false : b = false
⊢ hasAssignment b f.assignments[i.val] = true
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
hf : hasAssignment b f.assignments[i.val] = true → unit (i, b) ∈ f.toList
i_in_bounds : i.val < f.assignments.size
l_in_bounds : l.val < f.assignments.size
ib_ne_c : ¬(i, b) = (l, true)
l_eq_i : l.val = i.val
b_eq_false : b = false
hb : f.assignments[i.val].hasNegAssignment = true
⊢ hasAssignment b f.assignments[i.val] = true