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Proof step 20 from proof always-noincrease-stable (previous step)

□ (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 21:
□ (A'' ≪ A ∨ A'' = A), a = A ⊦ □ (A ≪ a ∨ A = a)

Rule argument

poslist: left 3

Additional information