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Theorem Union
⊦ a ∈ s1 ∪ s2 ↔ a ∈ s1 ∨ a ∈ s2
Type: An axiom
Validity: The proof is valid.
Features: simp, localsimp, nokodkodax,
Comment:
Used by:
diff-int-01
,
diff-subset
,
size-union
,
sub-union-02
,
sub-union-05
,
unrax
,
Used by units in proved state:
store+set
,
Proof exists?: No