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Theorem rec

⊦ str1 ≠ "" → (char ' + str = str1 ↔ char = str1.char1 ∧ str = str1.rstring)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 2
Used lemmas: append-base, append-rec, chartostring,
Used spec theorems:
- Used simplifier rules: