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Theorem char-in-rec

⊦ char ∈ char0 ' + str ↔ char = char0 ∨ char ∈ str

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 1
Used lemmas: char-in-01, in-def,
Used spec theorems:
- Used simplifier rules:
  - string2list/s2l-rec
  - string-append/assoc
  - list/charlist/in-01
  - list/charlist/a
  - list/charlist/in-append
  - list/charlist/in-17