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Theorem to-empty-fin2

⊦ n ≤ # x → (x to n = [] ↔ n = 0)

Type: A user defined theorem
Validity: The proof is valid.
Features: localsimp, simp,
Comment:
Used by: to-empty2,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 2
Used lemmas: length-to, to-zero-l,
Used spec theorems:
- list-del/extension
Used simplifier rules:
- nat/le-ls-simp
- list-data/size-01