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Proof step 3 from proof del-lists-1 (previous step)

⊦ del-list(r ', n) = _∃(λ x. ls(r, x) ∧ ⌜n = # x⌝ ), r = null

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: list, inst: reflist name: One seq: ⊦ r ' = r + [] subst: [r] → [r] flags: <all paths>

Additional information

Used terms: r