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Theorem in-del-01

⊦ r -- sk ∈ st -- r0 ↔ ¬ ¬ (r ≠ r0 ∧ r -- sk ∈ st)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 8
Used lemmas: instore-01, look-del, deleteref,
Used spec theorems:
- Used simplifier rules: