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Theorem del-y
⊦ (a ' + x) -l a = x -l a
Type: An axiom
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
del-append
,
del-del
,
del-del1-nodups
,
del-del1-switch
,
del-length
,
del-rev
,
del-rmdup
,
del1-del
,
del1-del-switch
,
delete-dups
,
in
,
in-01
,
in-02
,
one
,
rmdup-del1-del
,
rmdup-last
,
size-del-nodups
,
size-rmdup-del
,
sw
,
Used by units in proved state:
list-set
,
list-perm
,
Proof exists?: No