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Proof step 2 from proof size-one-03 (previous step)

# s = 1 ⊦ ∃ a. s = ∅ ++ a

User applied rule insert lemma

And obtained the following new goals

Rule argument

spec: set-basic inst: name: size-one seq: ⊦ # s = 1 → (∃ a. s = ∅ ++ a) subst: [s] → [s] flags: current, []

Additional information

Used terms: s