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Proof step 17 from proof always-noincrease-stable (previous step)

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

User applied rule weakening

And obtained the following new goals

Proof step 18:
□ (A'' ≪ A ∨ A'' = A) ⊦ □ ⟨a := A⟩ (□ (A ≪ a ∨ A = a))

Rule argument

poslist: right 2, right 3

Additional information