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Theorem append-eqlen

⊦ # str = # str1 → (str + str0 = str1 + str2 ↔ str = str1 ∧ str0 = str2)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 6
Used lemmas: append-eqlen-01, Length-rec, len-zero, Length-empty,
Used spec theorems:
- Used simplifier rules: