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Theorem firstN

⊦ list2set(x) ∩ s = ∅ ∧ n < # x → list2set(firstn(n, x)) ∩ s = ∅

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 5
Used lemmas: list2set-rec, list2set-empty,
Used spec theorems:
- Used simplifier rules: