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Proof step 2 from proof not-always-decrease (previous step)

□ ⟨a := A⟩ (◇ A ≪ a), ∃ a. a = A ⊦

User applied rule exists left

And obtained the following new goals

Proof step 3:
□ ⟨a := A⟩ (◇ A ≪ a), a = A ⊦

Rule argument

pos: left 2

Additional information