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Theorem postfix-rec-right

⊦ a ' + y ⊒ x ↔ x = a ' + y ∨ y ⊒ x

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 6
Used lemmas: postfix,
Used spec theorems:
- Used simplifier rules:
  - list/in-append0-not-left
  - list/a
  - list/in-append
  - list/app-05
  - list/in-14
  - list/c-06
  - list/app-02
  - list/e
  - list/c
  - list/in-rec
  - list/len-06
  - list/c-05