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Theorem firstn-prefix

⊦ n ≤ # x → (¬ firstn(n, x) ⊑ x ↔ false)

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: firstn-prefix-02, firstn-prefix-03, firstn-prefix-04,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 8
Used lemmas: firstN-zero, firstN-rec-01, firstN-empty,
Used spec theorems:
- Used simplifier rules: