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Proof step 17 from proof not-always-decrease (previous step)

\A ∀ A, a0. a ≠ A ∨ ¬ □ ⟨a0 := A⟩ (◇ A ≪ a0) ∨ a0 ≠ A, □ ⟨a0 := A⟩ (◇ A ≪ a0), ⟨a0 := A⟩ (◇ A ≪ a0), a = A, A ≪ a0 ⊦

User applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: A, a abort: F discard: T computed: T

Additional information

Used terms: A, a