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Proof step 5 from proof always-noincrease-stable (previous step)

□ ⟨a := A⟩ (□ (A ≪ a ∨ A = a)), ⟨a := A⟩ (□ (A ≪ a ∨ A = a)), □ (A'' ≪ A ∨ A'' = A), A'' ≪ A ∨ A'' = A ⊦ ⟨a := A⟩ (◇ A ≪ a), ◇ □ A'' = A, □ A'' = A

User applied rule assign left

And obtained the following new goals

Proof step 6:
□ (A ≪ a ∨ A = a), □ ⟨a0 := A⟩ (□ (A ≪ a0 ∨ A = a0)), □ (A'' ≪ A ∨ A'' = A), a = A, A'' ≪ A ∨ A'' = A ⊦ ⟨a0 := A⟩ (◇ A ≪ a0), ◇ □ A'' = A, □ A'' = A

Rule argument

pos: left 2

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