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| Mirrors > Home > MPE Home > Th. List > Mathboxes > oninhaus | Structured version Visualization version GIF version | ||
| Description: The ordinal Hausdorff spaces are 1o and 2o. (Contributed by Chen-Pang He, 10-Nov-2015.) |
| Ref | Expression |
|---|---|
| oninhaus | ⊢ (On ∩ Haus) = {1o, 2o} |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | haust1 23478 | . . . . 5 ⊢ (𝑥 ∈ Haus → 𝑥 ∈ Fre) | |
| 2 | 1 | ssriv 3949 | . . . 4 ⊢ Haus ⊆ Fre |
| 3 | sslin 4203 | . . . 4 ⊢ (Haus ⊆ Fre → (On ∩ Haus) ⊆ (On ∩ Fre)) | |
| 4 | 2, 3 | ax-mp 5 | . . 3 ⊢ (On ∩ Haus) ⊆ (On ∩ Fre) |
| 5 | onint1 36849 | . . 3 ⊢ (On ∩ Fre) = {1o, 2o} | |
| 6 | 4, 5 | sseqtri 3993 | . 2 ⊢ (On ∩ Haus) ⊆ {1o, 2o} |
| 7 | ssoninhaus 36848 | . 2 ⊢ {1o, 2o} ⊆ (On ∩ Haus) | |
| 8 | 6, 7 | eqssi 3961 | 1 ⊢ (On ∩ Haus) = {1o, 2o} |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1567 ∩ cin 3912 ⊆ wss 3913 {cpr 4596 Oncon0 6361 1oc1o 8446 2oc2o 8447 Frect1 23433 Hauscha 23434 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-ral 3086 df-rex 3096 df-rab 3424 df-v 3465 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-br 5114 df-opab 5178 df-mpt 5197 df-tr 5223 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-ord 6364 df-on 6365 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-fv 6545 df-1o 8453 df-2o 8454 df-topgen 17496 df-top 23020 df-topon 23037 df-cld 23145 df-t1 23440 df-haus 23441 |
| This theorem is referenced by: (None) |
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