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Theorem in-rec
⊦ a ∈ b ' + x ↔ a = b ∨ a ∈ x
Type: An axiom
Validity: The proof is valid.
Features: s, ls,
Comment:
Used by:
append-size-less
,
firstoc
,
in-17
,
in-append
,
in-def
,
inapp-02
,
inapp-05
,
inapp-07
,
inapp-08
,
inex-01
,
lastoc
,
len-01
,
len-03
,
len-04
,
neq-07
,
one
,
onein
,
Used by units in proved state:
list-del
,
olist
,
filter-count
,
assoclist
,
list-perm
,
list-set
,
path-reachable
,
infinite-append
,
list-dup
,
list-last
,
Proof exists?: No