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Theorem validrefs-delcycle-01

⊦ ¬ validrefs(str, refs + r ' + refs1, ty, st) → ¬ validrefs(str, refs + r ' + refs0 + r ' + refs1, ty, st)

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: pathex-def-nodups, validrefs-nodups-01,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 15
Proof steps: 29
Used lemmas: validrefs-array, validrefs-class, validrefs-superclass, validrefs-null-02, validrefs-is-junk, validrefs-postfix,
Used spec theorems:
- addfuns/is-valid-ref-stronger-def
Used simplifier rules:
- int-abs/lels-03
- int-abs/lels-04
- int-abs/lels
- int-abs/lels-01
- int-abs/forward-le-01
- int-abs/forward-le-05
- list/references/e-03
- list/references/first-02
- list/references/c
- list/references/e
- list/references/app-02-ant
- list/references/c-08
- list/references/a
- list/references/Nil