Theorem: LRAT.DefaultFormula.insertRat_entails_hsat
Proof state before:
case intro.inr.inl.intro.intro.intro.intro.intro.intro
n : Nat
f : DefaultFormula n
hf : f.ratUnits = #[] ∧ f.assignments_invariant
c : DefaultClause n
p : PosFin n → Bool
pf : p ⊨ f
insertUnit_fold_success : (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).2.snd = true
i : PosFin n
hboth : (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).snd.fst[i.val] = both
i_in_bounds : i.val < f.assignments.size
h0 : insertUnit_invariant f.assignments ⋯ f.ratUnits f.assignments ⋯
insertUnit_fold_satisfies_invariant :
  let update_res := List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate;
  let_fun update_res_size := ⋯;
  insertUnit_invariant f.assignments ⋯ update_res.fst update_res.snd.fst update_res_size
j : Fin (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).fst.size
b : Bool
i_gt_zero : ↑⟨i.val, ⋯⟩ > 0
h1 : (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).fst[j] = (⟨↑⟨i.val, ⋯⟩, ⋯⟩, b)
h2 :
  (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).snd.fst[↑⟨i.val, ⋯⟩] =
    addAssignment b f.assignments[↑⟨i.val, ⋯⟩]
h3 : ¬hasAssignment b f.assignments[↑⟨i.val, ⋯⟩] = true
h4 :
  ∀ (k : Fin (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).fst.size),
    k ≠ j → (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).fst[k].fst.val ≠ ↑⟨i.val, ⋯⟩
⊢ (i, false) ∈ Clause.toList c ∧ decide (p i = false) = true ∨ (i, true) ∈ Clause.toList c ∧ p i = true
Tactic:
have ib_in_insertUnit_fold : (i, b) ∈ (List.foldl insertUnit (f.ratUnits, f.assignments, false) (negate c)).1.data := by
  have i_rw : i = ⟨i.1, i.2⟩ := rfl
  rw [i_rw, ← h1]
  apply List.get_mem
Proof state after:
case intro.inr.inl.intro.intro.intro.intro.intro.intro
n : Nat
f : DefaultFormula n
hf : f.ratUnits = #[] ∧ f.assignments_invariant
c : DefaultClause n
p : PosFin n → Bool
pf : p ⊨ f
insertUnit_fold_success : (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).2.snd = true
i : PosFin n
hboth : (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).snd.fst[i.val] = both
i_in_bounds : i.val < f.assignments.size
h0 : insertUnit_invariant f.assignments ⋯ f.ratUnits f.assignments ⋯
insertUnit_fold_satisfies_invariant :
  let update_res := List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate;
  let_fun update_res_size := ⋯;
  insertUnit_invariant f.assignments ⋯ update_res.fst update_res.snd.fst update_res_size
j : Fin (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).fst.size
b : Bool
i_gt_zero : ↑⟨i.val, ⋯⟩ > 0
h1 : (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).fst[j] = (⟨↑⟨i.val, ⋯⟩, ⋯⟩, b)
h2 :
  (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).snd.fst[↑⟨i.val, ⋯⟩] =
    addAssignment b f.assignments[↑⟨i.val, ⋯⟩]
h3 : ¬hasAssignment b f.assignments[↑⟨i.val, ⋯⟩] = true
h4 :
  ∀ (k : Fin (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).fst.size),
    k ≠ j → (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).fst[k].fst.val ≠ ↑⟨i.val, ⋯⟩
ib_in_insertUnit_fold : (i, b) ∈ (List.foldl insertUnit (f.ratUnits, f.assignments, false) c.negate).fst.data
⊢ (i, false) ∈ Clause.toList c ∧ decide (p i = false) = true ∨ (i, true) ∈ Clause.toList c ∧ p i = true