have hsize : performRupCheck_res.assignments.size = n := by
  rw [performRupCheck_preserves_assignments_size, insertRupUnits_preserves_assignments_size, f_readyForRatAdd.2.2.1]
n : Nat
f : DefaultFormula n
c : DefaultClause n
p : Literal (PosFin n)
rupHints : Array Nat
ratHints : Array (Nat × Array Nat)
f_readyForRatAdd : f.readyForRatAdd
_pc : p ∈ Clause.toList c
h✝³ : f.ratHintsExhaustive p ratHints = true
h✝² : ¬(f.insertRupUnits c.negate).snd = true
h✝¹ : ¬((f.insertRupUnits c.negate).fst.performRupCheck rupHints).2.2.snd = true
h✝ : ¬((f.insertRupUnits c.negate).fst.performRupCheck rupHints).2.2.fst = true
performRatCheck_fold_success :
  (Array.foldl (fun x ratHint => if x.snd = true then x.fst.performRatCheck p.negateLiteral ratHint else (x.fst, false))
        (((f.insertRupUnits c.negate).fst.performRupCheck rupHints).fst, true) ratHints 0).snd =
    true
fc : DefaultFormula n := (f.insertRupUnits c.negate).fst
fc_assignments_size : (f.insertRupUnits c.negate).fst.assignments.size = n
performRupCheck_res : DefaultFormula n := ((f.insertRupUnits c.negate).fst.performRupCheck rupHints).fst
⊢ performRupCheck_res.ratUnits = #[] ∧ performRupCheck_res.assignments.size = n
n : Nat
f : DefaultFormula n
c : DefaultClause n
p : Literal (PosFin n)
rupHints : Array Nat
ratHints : Array (Nat × Array Nat)
f_readyForRatAdd : f.readyForRatAdd
_pc : p ∈ Clause.toList c
h✝³ : f.ratHintsExhaustive p ratHints = true
h✝² : ¬(f.insertRupUnits c.negate).snd = true
h✝¹ : ¬((f.insertRupUnits c.negate).fst.performRupCheck rupHints).2.2.snd = true
h✝ : ¬((f.insertRupUnits c.negate).fst.performRupCheck rupHints).2.2.fst = true
performRatCheck_fold_success :
  (Array.foldl (fun x ratHint => if x.snd = true then x.fst.performRatCheck p.negateLiteral ratHint else (x.fst, false))
        (((f.insertRupUnits c.negate).fst.performRupCheck rupHints).fst, true) ratHints 0).snd =
    true
fc : DefaultFormula n := (f.insertRupUnits c.negate).fst
fc_assignments_size : (f.insertRupUnits c.negate).fst.assignments.size = n
performRupCheck_res : DefaultFormula n := ((f.insertRupUnits c.negate).fst.performRupCheck rupHints).fst
hsize : performRupCheck_res.assignments.size = n
⊢ performRupCheck_res.ratUnits = #[] ∧ performRupCheck_res.assignments.size = n