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Proof step 19 from proof always-noincrease-stable (previous step)

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

User applied rule assign right

And obtained the following new goals

Proof step 20:
□ (A'' ≪ A ∨ A'' = A), a = A, A'' ≪ A ∨ A'' = A ⊦ □ (A ≪ a ∨ A = a)

Rule argument

pos: right 1

Additional information