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Theorem rest-len

n ≤ # x ⊦ # restn(n, x) = # x - n

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: first-append-01, sublist-at, sublist-first-skip, sublist-restn-02,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 7
Used lemmas: restN-rec, restN-zero,
Used spec theorems:
- Used simplifier rules: