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Theorem oninhaus 33793
Description: The ordinal Hausdorff spaces are 1o and 2o. (Contributed by Chen-Pang He, 10-Nov-2015.)
Assertion
Ref Expression
oninhaus (On ∩ Haus) = {1o, 2o}

Proof of Theorem oninhaus
StepHypRef Expression
1 haust1 21954 . . . . 5 (𝑥 ∈ Haus → 𝑥 ∈ Fre)
21ssriv 3970 . . . 4 Haus ⊆ Fre
3 sslin 4210 . . . 4 (Haus ⊆ Fre → (On ∩ Haus) ⊆ (On ∩ Fre))
42, 3ax-mp 5 . . 3 (On ∩ Haus) ⊆ (On ∩ Fre)
5 onint1 33792 . . 3 (On ∩ Fre) = {1o, 2o}
64, 5sseqtri 4002 . 2 (On ∩ Haus) ⊆ {1o, 2o}
7 ssoninhaus 33791 . 2 {1o, 2o} ⊆ (On ∩ Haus)
86, 7eqssi 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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