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Theorem rm-vl-in-before

⊦ lref ∈ q → (lref ∈ q - lref0 ↔ lref ≠ lref0)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 19
Used lemmas: queue-rm-vl-rec, rm-vl-in-before-h, queue-in-vl,
Used spec theorems:
- Used simplifier rules:
  - list/erasequeue-base/in-empty
  - list/erasequeue-base/c
  - erasequeueentry/elim
  - list/erasequeue-base/a
  - list/erasequeue-base/in-rec
  - erasequeueentry/inj