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Theorem Union
⊦ a ∈ s1 ∪ s2 ↔ a ∈ s1 ∨ a ∈ s2
Type: An axiom
Validity: The proof is valid.
Features: ws, lws, nokodkodax,
Comment:
Used by:
diff-int-01
,
diff-subset
,
size-union
,
sub-union
,
sub-union-01
,
sub-union-02
,
sub-union-03
,
sub-union-04
,
sub-union-05
,
subset-is-union
,
unin
,
unin-01
,
unindel
,
uninsubdel
,
union-del
,
union-diff
,
union-size
,
union-size-02
,
union-size-03
,
union-size-insert
,
union-size-le
,
Used by units in proved state:
oset
,
store+set
,
Proof exists?: No