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Proof step 2 from proof lastoc-rew (previous step)

a ∈ x ⊦ ∃ y, z. x = y + a ' + z ∧ ¬ a ∈ z

User applied rule insert lemma

And obtained the following new goals

Rule argument

spec: list inst: name: lastoc seq: ⊦ a ∈ x → (∃ y, z. x = y + a ' + z ∧ ¬ a ∈ z) subst: [a, x] → [a, x] flags: current, []

Additional information

Used terms: a, x