Theorem: LRAT.DefaultFormula.insertUnit_preserves_invariant
Proof state before:
case inr.inr.intro.intro.intro.intro.intro.intro.intro.right.left
n : Nat
assignments0 : Array Assignment
assignments0_size : assignments0.size = n
units : Array (Literal (PosFin n))
assignments : Array Assignment
assignments_size : assignments.size = n
foundContradiction : Bool
l : Literal (PosFin n)
i : Fin n
i_in_bounds : ↑i < assignments.size
l_in_bounds : l.fst.val < assignments.size
j1 j2 : Fin units.size
i_gt_zero : ↑i > 0
h1 : units[↑j1] = (⟨↑i, ⋯⟩, true)
h2 : units[↑j2] = (⟨↑i, ⋯⟩, false)
h3 : assignments[↑i] = both
h4 : assignments0[↑i] = unassigned
h5 : ∀ (k : Fin units.size), ¬k = j1 → ¬k = j2 → ¬units[↑k].fst.val = ↑i
j1_lt_updatedUnits_size : ↑j1 < (insertUnit (units, assignments, foundContradiction) l).fst.size
j2_lt_updatedUnits_size : ↑j2 < (insertUnit (units, assignments, foundContradiction) l).fst.size
⊢ (if hasAssignment l.snd assignments[l.fst.val]! = true then (units, assignments, foundContradiction)
        else
          (units.push l, assignments.modify l.fst.val (addAssignment l.snd),
            foundContradiction || assignments[l.fst.val]! != unassigned)).fst[↑j2] =
    (⟨↑i, ⋯⟩, false)

case inr.inr.intro.intro.intro.intro.intro.intro.intro.right.right
n : Nat
assignments0 : Array Assignment
assignments0_size : assignments0.size = n
units : Array (Literal (PosFin n))
assignments : Array Assignment
assignments_size : assignments.size = n
foundContradiction : Bool
l : Literal (PosFin n)
i : Fin n
i_in_bounds : ↑i < assignments.size
l_in_bounds : l.fst.val < assignments.size
j1 j2 : Fin units.size
i_gt_zero : ↑i > 0
h1 : units[↑j1] = (⟨↑i, ⋯⟩, true)
h2 : units[↑j2] = (⟨↑i, ⋯⟩, false)
h3 : assignments[↑i] = both
h4 : assignments0[↑i] = unassigned
h5 : ∀ (k : Fin units.size), ¬k = j1 → ¬k = j2 → ¬units[↑k].fst.val = ↑i
j1_lt_updatedUnits_size : ↑j1 < (insertUnit (units, assignments, foundContradiction) l).fst.size
j2_lt_updatedUnits_size : ↑j2 < (insertUnit (units, assignments, foundContradiction) l).fst.size
⊢ (if hasAssignment l.snd assignments[l.fst.val]! = true then (units, assignments, foundContradiction)
            else
              (units.push l, assignments.modify l.fst.val (addAssignment l.snd),
                foundContradiction || assignments[l.fst.val]! != unassigned)).snd.fst[↑i] =
      both ∧
    assignments0[↑i] = unassigned ∧
      ∀
        (k :
          Fin
            (if hasAssignment l.snd assignments[l.fst.val]! = true then (units, assignments, foundContradiction)
                else
                  (units.push (l.fst, l.snd), assignments.modify l.fst.val (addAssignment l.snd),
                    foundContradiction || assignments[l.fst.val]! != unassigned)).fst.size),
        ¬k = ⟨↑j1, j1_lt_updatedUnits_size⟩ →
          ¬k = ⟨↑j2, j2_lt_updatedUnits_size⟩ →
            ¬(if hasAssignment l.snd assignments[l.fst.val]! = true then (units, assignments, foundContradiction)
                        else
                          (units.push l, assignments.modify l.fst.val (addAssignment l.snd),
                            foundContradiction || assignments[l.fst.val]! != unassigned)).fst[↑k].fst.val =
                ↑i
Tactic:
. split
  . exact h2
  . simp only [Array.get_push_lt units l j2.1 j2.2, h2]
Proof state after:
case inr.inr.intro.intro.intro.intro.intro.intro.intro.right.right
n : Nat
assignments0 : Array Assignment
assignments0_size : assignments0.size = n
units : Array (Literal (PosFin n))
assignments : Array Assignment
assignments_size : assignments.size = n
foundContradiction : Bool
l : Literal (PosFin n)
i : Fin n
i_in_bounds : ↑i < assignments.size
l_in_bounds : l.fst.val < assignments.size
j1 j2 : Fin units.size
i_gt_zero : ↑i > 0
h1 : units[↑j1] = (⟨↑i, ⋯⟩, true)
h2 : units[↑j2] = (⟨↑i, ⋯⟩, false)
h3 : assignments[↑i] = both
h4 : assignments0[↑i] = unassigned
h5 : ∀ (k : Fin units.size), ¬k = j1 → ¬k = j2 → ¬units[↑k].fst.val = ↑i
j1_lt_updatedUnits_size : ↑j1 < (insertUnit (units, assignments, foundContradiction) l).fst.size
j2_lt_updatedUnits_size : ↑j2 < (insertUnit (units, assignments, foundContradiction) l).fst.size
⊢ (if hasAssignment l.snd assignments[l.fst.val]! = true then (units, assignments, foundContradiction)
            else
              (units.push l, assignments.modify l.fst.val (addAssignment l.snd),
                foundContradiction || assignments[l.fst.val]! != unassigned)).snd.fst[↑i] =
      both ∧
    assignments0[↑i] = unassigned ∧
      ∀
        (k :
          Fin
            (if hasAssignment l.snd assignments[l.fst.val]! = true then (units, assignments, foundContradiction)
                else
                  (units.push (l.fst, l.snd), assignments.modify l.fst.val (addAssignment l.snd),
                    foundContradiction || assignments[l.fst.val]! != unassigned)).fst.size),
        ¬k = ⟨↑j1, j1_lt_updatedUnits_size⟩ →
          ¬k = ⟨↑j2, j2_lt_updatedUnits_size⟩ →
            ¬(if hasAssignment l.snd assignments[l.fst.val]! = true then (units, assignments, foundContradiction)
                        else
                          (units.push l, assignments.modify l.fst.val (addAssignment l.snd),
                            foundContradiction || assignments[l.fst.val]! != unassigned)).fst[↑k].fst.val =
                ↑i