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Theorem dislly 21502
Description: The discrete space 𝒫 𝑋 is locally 𝐴 if and only if every singleton space has property 𝐴. (Contributed by Mario Carneiro, 20-Mar-2015.)
Assertion
Ref Expression
dislly (𝑋𝑉 → (𝒫 𝑋 ∈ Locally 𝐴 ↔ ∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴))
Distinct variable groups:   𝑥,𝐴   𝑥,𝑉   𝑥,𝑋

Proof of Theorem dislly
Dummy variables 𝑢 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 simplr 809 . . . . 5 (((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) → 𝒫 𝑋 ∈ Locally 𝐴)
2 simpr 479 . . . . . 6 (((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) → 𝑥𝑋)
3 vex 3343 . . . . . . 7 𝑥 ∈ V
43snelpw 5062 . . . . . 6 (𝑥𝑋 ↔ {𝑥} ∈ 𝒫 𝑋)
52, 4sylib 208 . . . . 5 (((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) → {𝑥} ∈ 𝒫 𝑋)
6 vsnid 4354 . . . . . 6 𝑥 ∈ {𝑥}
76a1i 11 . . . . 5 (((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) → 𝑥 ∈ {𝑥})
8 llyi 21479 . . . . 5 ((𝒫 𝑋 ∈ Locally 𝐴 ∧ {𝑥} ∈ 𝒫 𝑋𝑥 ∈ {𝑥}) → ∃𝑦 ∈ 𝒫 𝑋(𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴))
91, 5, 7, 8syl3anc 1477 . . . 4 (((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) → ∃𝑦 ∈ 𝒫 𝑋(𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴))
10 simpr1 1234 . . . . . . . . . 10 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → 𝑦 ⊆ {𝑥})
11 simpr2 1236 . . . . . . . . . . 11 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → 𝑥𝑦)
1211snssd 4485 . . . . . . . . . 10 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → {𝑥} ⊆ 𝑦)
1310, 12eqssd 3761 . . . . . . . . 9 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → 𝑦 = {𝑥})
1413oveq2d 6829 . . . . . . . 8 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → (𝒫 𝑋t 𝑦) = (𝒫 𝑋t {𝑥}))
15 simplll 815 . . . . . . . . 9 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → 𝑋𝑉)
16 simplr 809 . . . . . . . . . 10 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → 𝑥𝑋)
1716snssd 4485 . . . . . . . . 9 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → {𝑥} ⊆ 𝑋)
18 restdis 21184 . . . . . . . . 9 ((𝑋𝑉 ∧ {𝑥} ⊆ 𝑋) → (𝒫 𝑋t {𝑥}) = 𝒫 {𝑥})
1915, 17, 18syl2anc 696 . . . . . . . 8 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → (𝒫 𝑋t {𝑥}) = 𝒫 {𝑥})
2014, 19eqtrd 2794 . . . . . . 7 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → (𝒫 𝑋t 𝑦) = 𝒫 {𝑥})
21 simpr3 1238 . . . . . . 7 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → (𝒫 𝑋t 𝑦) ∈ 𝐴)
2220, 21eqeltrrd 2840 . . . . . 6 ((((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) ∧ (𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴)) → 𝒫 {𝑥} ∈ 𝐴)
2322ex 449 . . . . 5 (((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) → ((𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴) → 𝒫 {𝑥} ∈ 𝐴))
2423rexlimdvw 3172 . . . 4 (((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) → (∃𝑦 ∈ 𝒫 𝑋(𝑦 ⊆ {𝑥} ∧ 𝑥𝑦 ∧ (𝒫 𝑋t 𝑦) ∈ 𝐴) → 𝒫 {𝑥} ∈ 𝐴))
259, 24mpd 15 . . 3 (((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) ∧ 𝑥𝑋) → 𝒫 {𝑥} ∈ 𝐴)
2625ralrimiva 3104 . 2 ((𝑋𝑉 ∧ 𝒫 𝑋 ∈ Locally 𝐴) → ∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴)
27 distop 21001 . . . 4 (𝑋𝑉 → 𝒫 𝑋 ∈ Top)
2827adantr 472 . . 3 ((𝑋𝑉 ∧ ∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴) → 𝒫 𝑋 ∈ Top)
29 elpwi 4312 . . . . . . . . 9 (𝑦 ∈ 𝒫 𝑋𝑦𝑋)
3029adantl 473 . . . . . . . 8 ((𝑋𝑉𝑦 ∈ 𝒫 𝑋) → 𝑦𝑋)
31 ssralv 3807 . . . . . . . 8 (𝑦𝑋 → (∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴 → ∀𝑥𝑦 𝒫 {𝑥} ∈ 𝐴))
3230, 31syl 17 . . . . . . 7 ((𝑋𝑉𝑦 ∈ 𝒫 𝑋) → (∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴 → ∀𝑥𝑦 𝒫 {𝑥} ∈ 𝐴))
33 simprl 811 . . . . . . . . . . . . . 14 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → 𝑥𝑦)
3433snssd 4485 . . . . . . . . . . . . 13 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → {𝑥} ⊆ 𝑦)
3530adantr 472 . . . . . . . . . . . . 13 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → 𝑦𝑋)
3634, 35sstrd 3754 . . . . . . . . . . . 12 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → {𝑥} ⊆ 𝑋)
37 snex 5057 . . . . . . . . . . . . 13 {𝑥} ∈ V
3837elpw 4308 . . . . . . . . . . . 12 ({𝑥} ∈ 𝒫 𝑋 ↔ {𝑥} ⊆ 𝑋)
3936, 38sylibr 224 . . . . . . . . . . 11 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → {𝑥} ∈ 𝒫 𝑋)
4037elpw 4308 . . . . . . . . . . . 12 ({𝑥} ∈ 𝒫 𝑦 ↔ {𝑥} ⊆ 𝑦)
4134, 40sylibr 224 . . . . . . . . . . 11 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → {𝑥} ∈ 𝒫 𝑦)
4239, 41elind 3941 . . . . . . . . . 10 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → {𝑥} ∈ (𝒫 𝑋 ∩ 𝒫 𝑦))
43 snidg 4351 . . . . . . . . . . 11 (𝑥𝑦𝑥 ∈ {𝑥})
4443ad2antrl 766 . . . . . . . . . 10 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → 𝑥 ∈ {𝑥})
45 simpll 807 . . . . . . . . . . . 12 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → 𝑋𝑉)
4645, 36, 18syl2anc 696 . . . . . . . . . . 11 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → (𝒫 𝑋t {𝑥}) = 𝒫 {𝑥})
47 simprr 813 . . . . . . . . . . 11 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → 𝒫 {𝑥} ∈ 𝐴)
4846, 47eqeltrd 2839 . . . . . . . . . 10 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → (𝒫 𝑋t {𝑥}) ∈ 𝐴)
49 eleq2 2828 . . . . . . . . . . . 12 (𝑢 = {𝑥} → (𝑥𝑢𝑥 ∈ {𝑥}))
50 oveq2 6821 . . . . . . . . . . . . 13 (𝑢 = {𝑥} → (𝒫 𝑋t 𝑢) = (𝒫 𝑋t {𝑥}))
5150eleq1d 2824 . . . . . . . . . . . 12 (𝑢 = {𝑥} → ((𝒫 𝑋t 𝑢) ∈ 𝐴 ↔ (𝒫 𝑋t {𝑥}) ∈ 𝐴))
5249, 51anbi12d 749 . . . . . . . . . . 11 (𝑢 = {𝑥} → ((𝑥𝑢 ∧ (𝒫 𝑋t 𝑢) ∈ 𝐴) ↔ (𝑥 ∈ {𝑥} ∧ (𝒫 𝑋t {𝑥}) ∈ 𝐴)))
5352rspcev 3449 . . . . . . . . . 10 (({𝑥} ∈ (𝒫 𝑋 ∩ 𝒫 𝑦) ∧ (𝑥 ∈ {𝑥} ∧ (𝒫 𝑋t {𝑥}) ∈ 𝐴)) → ∃𝑢 ∈ (𝒫 𝑋 ∩ 𝒫 𝑦)(𝑥𝑢 ∧ (𝒫 𝑋t 𝑢) ∈ 𝐴))
5442, 44, 48, 53syl12anc 1475 . . . . . . . . 9 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ (𝑥𝑦 ∧ 𝒫 {𝑥} ∈ 𝐴)) → ∃𝑢 ∈ (𝒫 𝑋 ∩ 𝒫 𝑦)(𝑥𝑢 ∧ (𝒫 𝑋t 𝑢) ∈ 𝐴))
5554expr 644 . . . . . . . 8 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ 𝑥𝑦) → (𝒫 {𝑥} ∈ 𝐴 → ∃𝑢 ∈ (𝒫 𝑋 ∩ 𝒫 𝑦)(𝑥𝑢 ∧ (𝒫 𝑋t 𝑢) ∈ 𝐴)))
5655ralimdva 3100 . . . . . . 7 ((𝑋𝑉𝑦 ∈ 𝒫 𝑋) → (∀𝑥𝑦 𝒫 {𝑥} ∈ 𝐴 → ∀𝑥𝑦𝑢 ∈ (𝒫 𝑋 ∩ 𝒫 𝑦)(𝑥𝑢 ∧ (𝒫 𝑋t 𝑢) ∈ 𝐴)))
5732, 56syld 47 . . . . . 6 ((𝑋𝑉𝑦 ∈ 𝒫 𝑋) → (∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴 → ∀𝑥𝑦𝑢 ∈ (𝒫 𝑋 ∩ 𝒫 𝑦)(𝑥𝑢 ∧ (𝒫 𝑋t 𝑢) ∈ 𝐴)))
5857imp 444 . . . . 5 (((𝑋𝑉𝑦 ∈ 𝒫 𝑋) ∧ ∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴) → ∀𝑥𝑦𝑢 ∈ (𝒫 𝑋 ∩ 𝒫 𝑦)(𝑥𝑢 ∧ (𝒫 𝑋t 𝑢) ∈ 𝐴))
5958an32s 881 . . . 4 (((𝑋𝑉 ∧ ∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴) ∧ 𝑦 ∈ 𝒫 𝑋) → ∀𝑥𝑦𝑢 ∈ (𝒫 𝑋 ∩ 𝒫 𝑦)(𝑥𝑢 ∧ (𝒫 𝑋t 𝑢) ∈ 𝐴))
6059ralrimiva 3104 . . 3 ((𝑋𝑉 ∧ ∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴) → ∀𝑦 ∈ 𝒫 𝑋𝑥𝑦𝑢 ∈ (𝒫 𝑋 ∩ 𝒫 𝑦)(𝑥𝑢 ∧ (𝒫 𝑋t 𝑢) ∈ 𝐴))
61 islly 21473 . . 3 (𝒫 𝑋 ∈ Locally 𝐴 ↔ (𝒫 𝑋 ∈ Top ∧ ∀𝑦 ∈ 𝒫 𝑋𝑥𝑦𝑢 ∈ (𝒫 𝑋 ∩ 𝒫 𝑦)(𝑥𝑢 ∧ (𝒫 𝑋t 𝑢) ∈ 𝐴)))
6228, 60, 61sylanbrc 701 . 2 ((𝑋𝑉 ∧ ∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴) → 𝒫 𝑋 ∈ Locally 𝐴)
6326, 62impbida 913 1 (𝑋𝑉 → (𝒫 𝑋 ∈ Locally 𝐴 ↔ ∀𝑥𝑋 𝒫 {𝑥} ∈ 𝐴))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383  w3a 1072   = wceq 1632  wcel 2139  wral 3050  wrex 3051  cin 3714  wss 3715  𝒫 cpw 4302  {csn 4321  (class class class)co 6813  t crest 16283  Topctop 20900  Locally clly 21469
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-rep 4923  ax-sep 4933  ax-nul 4941  ax-pow 4992  ax-pr 5055  ax-un 7114
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1073  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-reu 3057  df-rab 3059  df-v 3342  df-sbc 3577  df-csb 3675  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-pss 3731  df-nul 4059  df-if 4231  df-pw 4304  df-sn 4322  df-pr 4324  df-tp 4326  df-op 4328  df-uni 4589  df-int 4628  df-iun 4674  df-br 4805  df-opab 4865  df-mpt 4882  df-tr 4905  df-id 5174  df-eprel 5179  df-po 5187  df-so 5188  df-fr 5225  df-we 5227  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-rn 5277  df-res 5278  df-ima 5279  df-pred 5841  df-ord 5887  df-on 5888  df-lim 5889  df-suc 5890  df-iota 6012  df-fun 6051  df-fn 6052  df-f 6053  df-f1 6054  df-fo 6055  df-f1o 6056  df-fv 6057  df-ov 6816  df-oprab 6817  df-mpt2 6818  df-om 7231  df-1st 7333  df-2nd 7334  df-wrecs 7576  df-recs 7637  df-rdg 7675  df-oadd 7733  df-er 7911  df-en 8122  df-fin 8125  df-fi 8482  df-rest 16285  df-topgen 16306  df-top 20901  df-topon 20918  df-bases 20952  df-lly 21471
This theorem is referenced by:  disllycmp  21503  dis1stc  21504
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