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Theorem len-app

⊦ #(str + str0) = # str + # str0

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: append-eqlen-01, eq-one, neq-one,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 3
Used lemmas: Length-rec, Length-empty,
Used spec theorems:
- Used simplifier rules: