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Theorem oninhaus 36632
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 23317 . . . . 5 (𝑥 ∈ Haus → 𝑥 ∈ Fre)
21ssriv 3925 . . . 4 Haus ⊆ Fre
3 sslin 4183 . . . 4 (Haus ⊆ Fre → (On ∩ Haus) ⊆ (On ∩ Fre))
42, 3ax-mp 5 . . 3 (On ∩ Haus) ⊆ (On ∩ Fre)
5 onint1 36631 . . 3 (On ∩ Fre) = {1o, 2o}
64, 5sseqtri 3970 . 2 (On ∩ Haus) ⊆ {1o, 2o}
7 ssoninhaus 36630 . 2 {1o, 2o} ⊆ (On ∩ Haus)
86, 7eqssi 3938 1 (On ∩ Haus) = {1o, 2o}
Colors of variables: wff setvar class
Syntax hints:   = wceq 1542  cin 3888  wss 3889  {cpr 4569  Oncon0 6323  1oc1o 8398  2oc2o 8399  Frect1 23272  Hauscha 23273
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 2708  ax-sep 5231  ax-nul 5241  ax-pow 5307  ax-pr 5375  ax-un 7689
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 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-pss 3909  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-mpt 5167  df-tr 5193  df-id 5526  df-eprel 5531  df-po 5539  df-so 5540  df-fr 5584  df-we 5586  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-ord 6326  df-on 6327  df-suc 6329  df-iota 6454  df-fun 6500  df-fn 6501  df-fv 6506  df-1o 8405  df-2o 8406  df-topgen 17406  df-top 22859  df-topon 22876  df-cld 22984  df-t1 23279  df-haus 23280
This theorem is referenced by: (None)
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