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Theorem diff-n
⊦ ¬ a ∈ y → (a ' + x) \ y = a + (x \ y)
Type: An axiom
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
diff-append
,
diff-consnotin2
,
diff-dups
,
diff-empty
,
diff-empty-all
,
diff-in
,
diff-onenonmember
,
diff-twice-append
,
diff-twice-append-rev
,
diff-twice-union
,
diff-unchanged
,
diff-union
,
diff-wfrec
,
diffgetn-nodupssize
,
diffone-nodupsget
,
diffone-nodupssize
,
notin-01
,
rax-01
,
Used by units in proved state:
list-perm
,
Proof exists?: No