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Theorem first-01

⊦ str ≠ "" → (str + str0).char1 = str.char1

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 2
Used lemmas: append-rec,
Used spec theorems:
- Used simplifier rules:
  - string-data/sel-01
  - string-data/elim