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Theorem first-all-01

⊦ # x = n → firstn(n, x) = x

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: first-mklist-04, rest-sub, 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: 1
Used lemmas: first-all,
Used spec theorems:
- Used simplifier rules: