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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 21954 | . . . . 5 ⊢ (𝑥 ∈ Haus → 𝑥 ∈ Fre) | |
2 | 1 | ssriv 3970 | . . . 4 ⊢ Haus ⊆ Fre |
3 | sslin 4210 | . . . 4 ⊢ (Haus ⊆ Fre → (On ∩ Haus) ⊆ (On ∩ Fre)) | |
4 | 2, 3 | ax-mp 5 | . . 3 ⊢ (On ∩ Haus) ⊆ (On ∩ Fre) |
5 | onint1 33792 | . . 3 ⊢ (On ∩ Fre) = {1o, 2o} | |
6 | 4, 5 | sseqtri 4002 | . 2 ⊢ (On ∩ Haus) ⊆ {1o, 2o} |
7 | ssoninhaus 33791 | . 2 ⊢ {1o, 2o} ⊆ (On ∩ Haus) | |
8 | 6, 7 | eqssi 3982 | 1 ⊢ (On ∩ Haus) = {1o, 2o} |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1533 ∩ cin 3934 ⊆ wss 3935 {cpr 4562 Oncon0 6185 1oc1o 8089 2oc2o 8090 Frect1 21909 Hauscha 21910 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-sbc 3772 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-br 5059 df-opab 5121 df-mpt 5139 df-tr 5165 df-id 5454 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-we 5510 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-ord 6188 df-on 6189 df-suc 6191 df-iota 6308 df-fun 6351 df-fn 6352 df-fv 6357 df-1o 8096 df-2o 8097 df-topgen 16711 df-top 21496 df-topon 21513 df-cld 21621 df-t1 21916 df-haus 21917 |
This theorem is referenced by: (None) |
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