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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 23239 | . . . . 5 ⊢ (𝑥 ∈ Haus → 𝑥 ∈ Fre) | |
| 2 | 1 | ssriv 3950 | . . . 4 ⊢ Haus ⊆ Fre |
| 3 | sslin 4206 | . . . 4 ⊢ (Haus ⊆ Fre → (On ∩ Haus) ⊆ (On ∩ Fre)) | |
| 4 | 2, 3 | ax-mp 5 | . . 3 ⊢ (On ∩ Haus) ⊆ (On ∩ Fre) |
| 5 | onint1 36437 | . . 3 ⊢ (On ∩ Fre) = {1o, 2o} | |
| 6 | 4, 5 | sseqtri 3995 | . 2 ⊢ (On ∩ Haus) ⊆ {1o, 2o} |
| 7 | ssoninhaus 36436 | . 2 ⊢ {1o, 2o} ⊆ (On ∩ Haus) | |
| 8 | 6, 7 | eqssi 3963 | 1 ⊢ (On ∩ Haus) = {1o, 2o} |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1540 ∩ cin 3913 ⊆ wss 3914 {cpr 4591 Oncon0 6332 1oc1o 8427 2oc2o 8428 Frect1 23194 Hauscha 23195 |
| 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 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pow 5320 ax-pr 5387 ax-un 7711 |
| 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-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-ral 3045 df-rex 3054 df-rab 3406 df-v 3449 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3934 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-br 5108 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5533 df-eprel 5538 df-po 5546 df-so 5547 df-fr 5591 df-we 5593 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-ord 6335 df-on 6336 df-suc 6338 df-iota 6464 df-fun 6513 df-fn 6514 df-fv 6519 df-1o 8434 df-2o 8435 df-topgen 17406 df-top 22781 df-topon 22798 df-cld 22906 df-t1 23201 df-haus 23202 |
| This theorem is referenced by: (None) |
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