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Mirrors > Home > MPE Home > Th. List > Mathboxes > ssoninhaus | Structured version Visualization version GIF version |
Description: The ordinal topologies 1o and 2o are Hausdorff. (Contributed by Chen-Pang He, 10-Nov-2015.) |
Ref | Expression |
---|---|
ssoninhaus | ⊢ {1o, 2o} ⊆ (On ∩ Haus) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1on 8103 | . . 3 ⊢ 1o ∈ On | |
2 | 2on 8105 | . . 3 ⊢ 2o ∈ On | |
3 | prssi 4747 | . . 3 ⊢ ((1o ∈ On ∧ 2o ∈ On) → {1o, 2o} ⊆ On) | |
4 | 1, 2, 3 | mp2an 690 | . 2 ⊢ {1o, 2o} ⊆ On |
5 | df1o2 8110 | . . . . 5 ⊢ 1o = {∅} | |
6 | pw0 4738 | . . . . 5 ⊢ 𝒫 ∅ = {∅} | |
7 | 5, 6 | eqtr4i 2847 | . . . 4 ⊢ 1o = 𝒫 ∅ |
8 | 0ex 5203 | . . . . 5 ⊢ ∅ ∈ V | |
9 | dishaus 21984 | . . . . 5 ⊢ (∅ ∈ V → 𝒫 ∅ ∈ Haus) | |
10 | 8, 9 | ax-mp 5 | . . . 4 ⊢ 𝒫 ∅ ∈ Haus |
11 | 7, 10 | eqeltri 2909 | . . 3 ⊢ 1o ∈ Haus |
12 | df2o2 8112 | . . . . 5 ⊢ 2o = {∅, {∅}} | |
13 | pwpw0 4739 | . . . . 5 ⊢ 𝒫 {∅} = {∅, {∅}} | |
14 | 12, 13 | eqtr4i 2847 | . . . 4 ⊢ 2o = 𝒫 {∅} |
15 | p0ex 5276 | . . . . 5 ⊢ {∅} ∈ V | |
16 | dishaus 21984 | . . . . 5 ⊢ ({∅} ∈ V → 𝒫 {∅} ∈ Haus) | |
17 | 15, 16 | ax-mp 5 | . . . 4 ⊢ 𝒫 {∅} ∈ Haus |
18 | 14, 17 | eqeltri 2909 | . . 3 ⊢ 2o ∈ Haus |
19 | prssi 4747 | . . 3 ⊢ ((1o ∈ Haus ∧ 2o ∈ Haus) → {1o, 2o} ⊆ Haus) | |
20 | 11, 18, 19 | mp2an 690 | . 2 ⊢ {1o, 2o} ⊆ Haus |
21 | 4, 20 | ssini 4207 | 1 ⊢ {1o, 2o} ⊆ (On ∩ Haus) |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2110 Vcvv 3494 ∩ cin 3934 ⊆ wss 3935 ∅c0 4290 𝒫 cpw 4538 {csn 4560 {cpr 4562 Oncon0 6185 1oc1o 8089 2oc2o 8090 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-tr 5165 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-we 5510 df-ord 6188 df-on 6189 df-suc 6191 df-1o 8096 df-2o 8097 df-top 21496 df-haus 21917 |
This theorem is referenced by: onint1 33792 oninhaus 33793 |
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