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Proof step 8 from proof always-noincrease-stable (previous step)

□ ⟨a1 := A⟩ (□ (A ≪ a1 ∨ A = a1)), □ (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 9:
□ A = a ⊦ □ A'' = A

Rule argument

poslist: left 1, left 2, left 4, left 5, right 1

Additional information