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Theorem del-lists-1

r ≠ null ⊦ del-list(r ', n) = _∃(λ x. ls(r, x) ∧ ⌜n = # x ∧ r ≠ null⌝ )

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 5
Proof steps: 13
Used lemmas: ex, del-list-base, del-list-rec,
Used spec theorems:
- list/reflist/One
- list/reflist/c
Used simplifier rules: