| Mathbox for Chen-Pang He |
< Previous
Next >
Nearby theorems |
||
| 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 23330 | . . . . 5 ⊢ (𝑥 ∈ Haus → 𝑥 ∈ Fre) | |
| 2 | 1 | ssriv 3926 | . . . 4 ⊢ Haus ⊆ Fre |
| 3 | sslin 4184 | . . . 4 ⊢ (Haus ⊆ Fre → (On ∩ Haus) ⊆ (On ∩ Fre)) | |
| 4 | 2, 3 | ax-mp 5 | . . 3 ⊢ (On ∩ Haus) ⊆ (On ∩ Fre) |
| 5 | onint1 36650 | . . 3 ⊢ (On ∩ Fre) = {1o, 2o} | |
| 6 | 4, 5 | sseqtri 3971 | . 2 ⊢ (On ∩ Haus) ⊆ {1o, 2o} |
| 7 | ssoninhaus 36649 | . 2 ⊢ {1o, 2o} ⊆ (On ∩ Haus) | |
| 8 | 6, 7 | eqssi 3939 | 1 ⊢ (On ∩ Haus) = {1o, 2o} |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ∩ cin 3889 ⊆ wss 3890 {cpr 4570 Oncon0 6318 1oc1o 8392 2oc2o 8393 Frect1 23285 Hauscha 23286 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pow 5303 ax-pr 5371 ax-un 7683 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-ord 6321 df-on 6322 df-suc 6324 df-iota 6449 df-fun 6495 df-fn 6496 df-fv 6501 df-1o 8399 df-2o 8400 df-topgen 17400 df-top 22872 df-topon 22889 df-cld 22997 df-t1 23292 df-haus 23293 |
| This theorem is referenced by: (None) |
| Copyright terms: Public domain | W3C validator |