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Mirrors > Home > MPE Home > Th. List > kqnrm | Structured version Visualization version GIF version |
Description: The Kolmogorov quotient of a normal space is normal. (Contributed by Mario Carneiro, 25-Aug-2015.) |
Ref | Expression |
---|---|
kqnrm | ⊢ (𝐽 ∈ Nrm ↔ (KQ‘𝐽) ∈ Nrm) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nrmtop 21140 | . . . 4 ⊢ (𝐽 ∈ Nrm → 𝐽 ∈ Top) | |
2 | eqid 2622 | . . . . 5 ⊢ ∪ 𝐽 = ∪ 𝐽 | |
3 | 2 | toptopon 20722 | . . . 4 ⊢ (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘∪ 𝐽)) |
4 | 1, 3 | sylib 208 | . . 3 ⊢ (𝐽 ∈ Nrm → 𝐽 ∈ (TopOn‘∪ 𝐽)) |
5 | eqid 2622 | . . . 4 ⊢ (𝑥 ∈ ∪ 𝐽 ↦ {𝑦 ∈ 𝐽 ∣ 𝑥 ∈ 𝑦}) = (𝑥 ∈ ∪ 𝐽 ↦ {𝑦 ∈ 𝐽 ∣ 𝑥 ∈ 𝑦}) | |
6 | 5 | kqnrmlem1 21546 | . . 3 ⊢ ((𝐽 ∈ (TopOn‘∪ 𝐽) ∧ 𝐽 ∈ Nrm) → (KQ‘𝐽) ∈ Nrm) |
7 | 4, 6 | mpancom 703 | . 2 ⊢ (𝐽 ∈ Nrm → (KQ‘𝐽) ∈ Nrm) |
8 | nrmtop 21140 | . . . . 5 ⊢ ((KQ‘𝐽) ∈ Nrm → (KQ‘𝐽) ∈ Top) | |
9 | kqtop 21548 | . . . . 5 ⊢ (𝐽 ∈ Top ↔ (KQ‘𝐽) ∈ Top) | |
10 | 8, 9 | sylibr 224 | . . . 4 ⊢ ((KQ‘𝐽) ∈ Nrm → 𝐽 ∈ Top) |
11 | 10, 3 | sylib 208 | . . 3 ⊢ ((KQ‘𝐽) ∈ Nrm → 𝐽 ∈ (TopOn‘∪ 𝐽)) |
12 | 5 | kqnrmlem2 21547 | . . 3 ⊢ ((𝐽 ∈ (TopOn‘∪ 𝐽) ∧ (KQ‘𝐽) ∈ Nrm) → 𝐽 ∈ Nrm) |
13 | 11, 12 | mpancom 703 | . 2 ⊢ ((KQ‘𝐽) ∈ Nrm → 𝐽 ∈ Nrm) |
14 | 7, 13 | impbii 199 | 1 ⊢ (𝐽 ∈ Nrm ↔ (KQ‘𝐽) ∈ Nrm) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 196 ∈ wcel 1990 {crab 2916 ∪ cuni 4436 ↦ cmpt 4729 ‘cfv 5888 Topctop 20698 TopOnctopon 20715 Nrmcnrm 21114 KQckq 21496 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-reu 2919 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-int 4476 df-iun 4522 df-iin 4523 df-br 4654 df-opab 4713 df-mpt 4730 df-id 5024 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-map 7859 df-qtop 16167 df-top 20699 df-topon 20716 df-cld 20823 df-cls 20825 df-cn 21031 df-nrm 21121 df-kq 21497 |
This theorem is referenced by: (None) |
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