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| Mirrors > Home > MPE Home > Th. List > kqhmph | Structured version Visualization version GIF version | ||
| Description: A topological space is T0 iff it is homeomorphic to its Kolmogorov quotient. (Contributed by Mario Carneiro, 25-Aug-2015.) |
| Ref | Expression |
|---|---|
| kqhmph | ⊢ (𝐽 ∈ Kol2 ↔ 𝐽 ≃ (KQ‘𝐽)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | t0top 23377 | . . . . . 6 ⊢ (𝐽 ∈ Kol2 → 𝐽 ∈ Top) | |
| 2 | toptopon2 22966 | . . . . . 6 ⊢ (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘∪ 𝐽)) | |
| 3 | 1, 2 | sylib 220 | . . . . 5 ⊢ (𝐽 ∈ Kol2 → 𝐽 ∈ (TopOn‘∪ 𝐽)) |
| 4 | eqid 2761 | . . . . . 6 ⊢ (𝑥 ∈ ∪ 𝐽 ↦ {𝑦 ∈ 𝐽 ∣ 𝑥 ∈ 𝑦}) = (𝑥 ∈ ∪ 𝐽 ↦ {𝑦 ∈ 𝐽 ∣ 𝑥 ∈ 𝑦}) | |
| 5 | 4 | t0kq 23866 | . . . . 5 ⊢ (𝐽 ∈ (TopOn‘∪ 𝐽) → (𝐽 ∈ Kol2 ↔ (𝑥 ∈ ∪ 𝐽 ↦ {𝑦 ∈ 𝐽 ∣ 𝑥 ∈ 𝑦}) ∈ (𝐽Homeo(KQ‘𝐽)))) |
| 6 | 3, 5 | syl 17 | . . . 4 ⊢ (𝐽 ∈ Kol2 → (𝐽 ∈ Kol2 ↔ (𝑥 ∈ ∪ 𝐽 ↦ {𝑦 ∈ 𝐽 ∣ 𝑥 ∈ 𝑦}) ∈ (𝐽Homeo(KQ‘𝐽)))) |
| 7 | 6 | ibi 269 | . . 3 ⊢ (𝐽 ∈ Kol2 → (𝑥 ∈ ∪ 𝐽 ↦ {𝑦 ∈ 𝐽 ∣ 𝑥 ∈ 𝑦}) ∈ (𝐽Homeo(KQ‘𝐽))) |
| 8 | hmphi 23825 | . . 3 ⊢ ((𝑥 ∈ ∪ 𝐽 ↦ {𝑦 ∈ 𝐽 ∣ 𝑥 ∈ 𝑦}) ∈ (𝐽Homeo(KQ‘𝐽)) → 𝐽 ≃ (KQ‘𝐽)) | |
| 9 | 7, 8 | syl 17 | . 2 ⊢ (𝐽 ∈ Kol2 → 𝐽 ≃ (KQ‘𝐽)) |
| 10 | hmphsym 23830 | . . 3 ⊢ (𝐽 ≃ (KQ‘𝐽) → (KQ‘𝐽) ≃ 𝐽) | |
| 11 | hmphtop1 23827 | . . . 4 ⊢ (𝐽 ≃ (KQ‘𝐽) → 𝐽 ∈ Top) | |
| 12 | kqt0 23794 | . . . 4 ⊢ (𝐽 ∈ Top ↔ (KQ‘𝐽) ∈ Kol2) | |
| 13 | 11, 12 | sylib 220 | . . 3 ⊢ (𝐽 ≃ (KQ‘𝐽) → (KQ‘𝐽) ∈ Kol2) |
| 14 | t0hmph 23838 | . . 3 ⊢ ((KQ‘𝐽) ≃ 𝐽 → ((KQ‘𝐽) ∈ Kol2 → 𝐽 ∈ Kol2)) | |
| 15 | 10, 13, 14 | sylc 65 | . 2 ⊢ (𝐽 ≃ (KQ‘𝐽) → 𝐽 ∈ Kol2) |
| 16 | 9, 15 | impbii 211 | 1 ⊢ (𝐽 ∈ Kol2 ↔ 𝐽 ≃ (KQ‘𝐽)) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 208 ∈ wcel 2141 {crab 3413 ∪ cuni 4862 class class class wbr 5097 ↦ cmpt 5178 ‘cfv 6516 (class class class)co 7391 Topctop 22941 TopOnctopon 22958 Kol2ct0 23354 KQckq 23741 Homeochmeo 23801 ≃ chmph 23802 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-rep 5224 ax-sep 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7713 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3076 df-rex 3086 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-iun 4948 df-br 5098 df-opab 5160 df-mpt 5179 df-id 5538 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-suc 6347 df-iota 6472 df-fun 6518 df-fn 6519 df-f 6520 df-f1 6521 df-fo 6522 df-f1o 6523 df-fv 6524 df-ov 7394 df-oprab 7395 df-mpo 7396 df-1st 7965 df-2nd 7966 df-1o 8431 df-map 8804 df-qtop 17528 df-top 22942 df-topon 22959 df-cn 23275 df-t0 23361 df-kq 23742 df-hmeo 23803 df-hmph 23804 |
| This theorem is referenced by: ist1-5lem 23868 t1r0 23869 |
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