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| Mirrors > Home > MPE Home > Th. List > Mathboxes > onsstopbas | Structured version Visualization version GIF version | ||
| Description: The class of ordinal numbers is a subclass of the class of topological bases. (Contributed by Chen-Pang He, 8-Oct-2015.) |
| Ref | Expression |
|---|---|
| onsstopbas | ⊢ On ⊆ TopBases |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ontopbas 36392 | . 2 ⊢ (𝑥 ∈ On → 𝑥 ∈ TopBases) | |
| 2 | 1 | ssriv 3962 | 1 ⊢ On ⊆ TopBases |
| Colors of variables: wff setvar class |
| Syntax hints: ⊆ wss 3926 Oncon0 6352 TopBasesctb 22881 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-ext 2707 ax-sep 5266 ax-nul 5276 ax-pr 5402 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-sb 2065 df-clab 2714 df-cleq 2727 df-clel 2809 df-ne 2933 df-ral 3052 df-rex 3061 df-rab 3416 df-v 3461 df-dif 3929 df-un 3931 df-in 3933 df-ss 3943 df-pss 3946 df-nul 4309 df-if 4501 df-pw 4577 df-sn 4602 df-pr 4604 df-op 4608 df-uni 4884 df-br 5120 df-opab 5182 df-tr 5230 df-eprel 5553 df-po 5561 df-so 5562 df-fr 5606 df-we 5608 df-ord 6355 df-on 6356 df-bases 22882 |
| This theorem is referenced by: onpsstopbas 36394 |
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