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Mirrors > Home > MPE Home > Th. List > orduniss | Structured version Visualization version GIF version |
Description: An ordinal class includes its union. (Contributed by NM, 13-Sep-2003.) |
Ref | Expression |
---|---|
orduniss | ⊢ (Ord 𝐴 → ∪ 𝐴 ⊆ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ordtr 5654 | . 2 ⊢ (Ord 𝐴 → Tr 𝐴) | |
2 | df-tr 4681 | . 2 ⊢ (Tr 𝐴 ↔ ∪ 𝐴 ⊆ 𝐴) | |
3 | 1, 2 | sylib 207 | 1 ⊢ (Ord 𝐴 → ∪ 𝐴 ⊆ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ⊆ wss 3540 ∪ cuni 4372 Tr wtr 4680 Ord word 5639 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 196 df-an 385 df-tr 4681 df-ord 5643 |
This theorem is referenced by: orduniorsuc 6922 onfununi 7325 rankuniss 8612 r1limwun 9437 ontgval 31600 |
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