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| Mirrors > Home > Home > Th. List > df-nomei | |||
| Description: {le nomei} is the empty set. Literally it is the set with zero cardinality. By standard folklore of sets, it is unique up to isomorphism, justifying {le}. |
| Ref | Expression |
|---|---|
| df-nomei | ⊢ naku ko'a cmima le nomei ku |
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