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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 21960 | . . . . 5 ⊢ (𝑥 ∈ Haus → 𝑥 ∈ Fre) | |
2 | 1 | ssriv 3971 | . . . 4 ⊢ Haus ⊆ Fre |
3 | sslin 4211 | . . . 4 ⊢ (Haus ⊆ Fre → (On ∩ Haus) ⊆ (On ∩ Fre)) | |
4 | 2, 3 | ax-mp 5 | . . 3 ⊢ (On ∩ Haus) ⊆ (On ∩ Fre) |
5 | onint1 33797 | . . 3 ⊢ (On ∩ Fre) = {1o, 2o} | |
6 | 4, 5 | sseqtri 4003 | . 2 ⊢ (On ∩ Haus) ⊆ {1o, 2o} |
7 | ssoninhaus 33796 | . 2 ⊢ {1o, 2o} ⊆ (On ∩ Haus) | |
8 | 6, 7 | eqssi 3983 | 1 ⊢ (On ∩ Haus) = {1o, 2o} |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ∩ cin 3935 ⊆ wss 3936 {cpr 4569 Oncon0 6191 1oc1o 8095 2oc2o 8096 Frect1 21915 Hauscha 21916 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 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 3773 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-ord 6194 df-on 6195 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-fv 6363 df-1o 8102 df-2o 8103 df-topgen 16717 df-top 21502 df-topon 21519 df-cld 21627 df-t1 21922 df-haus 21923 |
This theorem is referenced by: (None) |
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