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Theorem char-in

⊦ char ∈ l→s(chars) ↔ char ∈ chars

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 5
Used lemmas: char-in-rec, char-in-empty,
Used spec theorems:
- Used simplifier rules:
  - list/charlist/in-17
  - list/charlist/in-append
  - list/charlist/a
  - string-append/chartostring-01
  - string2list/l2s-rec
  - list/charlist/c
  - string2list/l2s-empty
  - list/charlist/in-empty