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Theorem txdis 21558
Description: The topological product of discrete spaces is discrete. (Contributed by Mario Carneiro, 14-Aug-2015.)
Assertion
Ref Expression
txdis ((𝐴𝑉𝐵𝑊) → (𝒫 𝐴 ×t 𝒫 𝐵) = 𝒫 (𝐴 × 𝐵))

Proof of Theorem txdis
Dummy variables 𝑥 𝑤 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 distop 20922 . . . . 5 (𝐴𝑉 → 𝒫 𝐴 ∈ Top)
2 distop 20922 . . . . 5 (𝐵𝑊 → 𝒫 𝐵 ∈ Top)
3 unipw 5023 . . . . . . 7 𝒫 𝐴 = 𝐴
43eqcomi 2733 . . . . . 6 𝐴 = 𝒫 𝐴
5 unipw 5023 . . . . . . 7 𝒫 𝐵 = 𝐵
65eqcomi 2733 . . . . . 6 𝐵 = 𝒫 𝐵
74, 6txuni 21518 . . . . 5 ((𝒫 𝐴 ∈ Top ∧ 𝒫 𝐵 ∈ Top) → (𝐴 × 𝐵) = (𝒫 𝐴 ×t 𝒫 𝐵))
81, 2, 7syl2an 495 . . . 4 ((𝐴𝑉𝐵𝑊) → (𝐴 × 𝐵) = (𝒫 𝐴 ×t 𝒫 𝐵))
9 eqimss2 3764 . . . 4 ((𝐴 × 𝐵) = (𝒫 𝐴 ×t 𝒫 𝐵) → (𝒫 𝐴 ×t 𝒫 𝐵) ⊆ (𝐴 × 𝐵))
108, 9syl 17 . . 3 ((𝐴𝑉𝐵𝑊) → (𝒫 𝐴 ×t 𝒫 𝐵) ⊆ (𝐴 × 𝐵))
11 sspwuni 4719 . . 3 ((𝒫 𝐴 ×t 𝒫 𝐵) ⊆ 𝒫 (𝐴 × 𝐵) ↔ (𝒫 𝐴 ×t 𝒫 𝐵) ⊆ (𝐴 × 𝐵))
1210, 11sylibr 224 . 2 ((𝐴𝑉𝐵𝑊) → (𝒫 𝐴 ×t 𝒫 𝐵) ⊆ 𝒫 (𝐴 × 𝐵))
13 elelpwi 4279 . . . . . . . . 9 ((𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵)) → 𝑦 ∈ (𝐴 × 𝐵))
1413adantl 473 . . . . . . . 8 (((𝐴𝑉𝐵𝑊) ∧ (𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵))) → 𝑦 ∈ (𝐴 × 𝐵))
15 xp1st 7317 . . . . . . . 8 (𝑦 ∈ (𝐴 × 𝐵) → (1st𝑦) ∈ 𝐴)
16 snelpwi 5017 . . . . . . . 8 ((1st𝑦) ∈ 𝐴 → {(1st𝑦)} ∈ 𝒫 𝐴)
1714, 15, 163syl 18 . . . . . . 7 (((𝐴𝑉𝐵𝑊) ∧ (𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵))) → {(1st𝑦)} ∈ 𝒫 𝐴)
18 xp2nd 7318 . . . . . . . 8 (𝑦 ∈ (𝐴 × 𝐵) → (2nd𝑦) ∈ 𝐵)
19 snelpwi 5017 . . . . . . . 8 ((2nd𝑦) ∈ 𝐵 → {(2nd𝑦)} ∈ 𝒫 𝐵)
2014, 18, 193syl 18 . . . . . . 7 (((𝐴𝑉𝐵𝑊) ∧ (𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵))) → {(2nd𝑦)} ∈ 𝒫 𝐵)
21 vsnid 4317 . . . . . . . 8 𝑦 ∈ {𝑦}
22 1st2nd2 7324 . . . . . . . . . 10 (𝑦 ∈ (𝐴 × 𝐵) → 𝑦 = ⟨(1st𝑦), (2nd𝑦)⟩)
2314, 22syl 17 . . . . . . . . 9 (((𝐴𝑉𝐵𝑊) ∧ (𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵))) → 𝑦 = ⟨(1st𝑦), (2nd𝑦)⟩)
2423sneqd 4297 . . . . . . . 8 (((𝐴𝑉𝐵𝑊) ∧ (𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵))) → {𝑦} = {⟨(1st𝑦), (2nd𝑦)⟩})
2521, 24syl5eleq 2809 . . . . . . 7 (((𝐴𝑉𝐵𝑊) ∧ (𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵))) → 𝑦 ∈ {⟨(1st𝑦), (2nd𝑦)⟩})
26 simprl 811 . . . . . . . . 9 (((𝐴𝑉𝐵𝑊) ∧ (𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵))) → 𝑦𝑥)
2723, 26eqeltrrd 2804 . . . . . . . 8 (((𝐴𝑉𝐵𝑊) ∧ (𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵))) → ⟨(1st𝑦), (2nd𝑦)⟩ ∈ 𝑥)
2827snssd 4448 . . . . . . 7 (((𝐴𝑉𝐵𝑊) ∧ (𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵))) → {⟨(1st𝑦), (2nd𝑦)⟩} ⊆ 𝑥)
29 xpeq1 5232 . . . . . . . . . 10 (𝑧 = {(1st𝑦)} → (𝑧 × 𝑤) = ({(1st𝑦)} × 𝑤))
3029eleq2d 2789 . . . . . . . . 9 (𝑧 = {(1st𝑦)} → (𝑦 ∈ (𝑧 × 𝑤) ↔ 𝑦 ∈ ({(1st𝑦)} × 𝑤)))
3129sseq1d 3738 . . . . . . . . 9 (𝑧 = {(1st𝑦)} → ((𝑧 × 𝑤) ⊆ 𝑥 ↔ ({(1st𝑦)} × 𝑤) ⊆ 𝑥))
3230, 31anbi12d 749 . . . . . . . 8 (𝑧 = {(1st𝑦)} → ((𝑦 ∈ (𝑧 × 𝑤) ∧ (𝑧 × 𝑤) ⊆ 𝑥) ↔ (𝑦 ∈ ({(1st𝑦)} × 𝑤) ∧ ({(1st𝑦)} × 𝑤) ⊆ 𝑥)))
33 xpeq2 5238 . . . . . . . . . . 11 (𝑤 = {(2nd𝑦)} → ({(1st𝑦)} × 𝑤) = ({(1st𝑦)} × {(2nd𝑦)}))
34 fvex 6314 . . . . . . . . . . . 12 (1st𝑦) ∈ V
35 fvex 6314 . . . . . . . . . . . 12 (2nd𝑦) ∈ V
3634, 35xpsn 6522 . . . . . . . . . . 11 ({(1st𝑦)} × {(2nd𝑦)}) = {⟨(1st𝑦), (2nd𝑦)⟩}
3733, 36syl6eq 2774 . . . . . . . . . 10 (𝑤 = {(2nd𝑦)} → ({(1st𝑦)} × 𝑤) = {⟨(1st𝑦), (2nd𝑦)⟩})
3837eleq2d 2789 . . . . . . . . 9 (𝑤 = {(2nd𝑦)} → (𝑦 ∈ ({(1st𝑦)} × 𝑤) ↔ 𝑦 ∈ {⟨(1st𝑦), (2nd𝑦)⟩}))
3937sseq1d 3738 . . . . . . . . 9 (𝑤 = {(2nd𝑦)} → (({(1st𝑦)} × 𝑤) ⊆ 𝑥 ↔ {⟨(1st𝑦), (2nd𝑦)⟩} ⊆ 𝑥))
4038, 39anbi12d 749 . . . . . . . 8 (𝑤 = {(2nd𝑦)} → ((𝑦 ∈ ({(1st𝑦)} × 𝑤) ∧ ({(1st𝑦)} × 𝑤) ⊆ 𝑥) ↔ (𝑦 ∈ {⟨(1st𝑦), (2nd𝑦)⟩} ∧ {⟨(1st𝑦), (2nd𝑦)⟩} ⊆ 𝑥)))
4132, 40rspc2ev 3428 . . . . . . 7 (({(1st𝑦)} ∈ 𝒫 𝐴 ∧ {(2nd𝑦)} ∈ 𝒫 𝐵 ∧ (𝑦 ∈ {⟨(1st𝑦), (2nd𝑦)⟩} ∧ {⟨(1st𝑦), (2nd𝑦)⟩} ⊆ 𝑥)) → ∃𝑧 ∈ 𝒫 𝐴𝑤 ∈ 𝒫 𝐵(𝑦 ∈ (𝑧 × 𝑤) ∧ (𝑧 × 𝑤) ⊆ 𝑥))
4217, 20, 25, 28, 41syl112anc 1443 . . . . . 6 (((𝐴𝑉𝐵𝑊) ∧ (𝑦𝑥𝑥 ∈ 𝒫 (𝐴 × 𝐵))) → ∃𝑧 ∈ 𝒫 𝐴𝑤 ∈ 𝒫 𝐵(𝑦 ∈ (𝑧 × 𝑤) ∧ (𝑧 × 𝑤) ⊆ 𝑥))
4342expr 644 . . . . 5 (((𝐴𝑉𝐵𝑊) ∧ 𝑦𝑥) → (𝑥 ∈ 𝒫 (𝐴 × 𝐵) → ∃𝑧 ∈ 𝒫 𝐴𝑤 ∈ 𝒫 𝐵(𝑦 ∈ (𝑧 × 𝑤) ∧ (𝑧 × 𝑤) ⊆ 𝑥)))
4443ralrimdva 3071 . . . 4 ((𝐴𝑉𝐵𝑊) → (𝑥 ∈ 𝒫 (𝐴 × 𝐵) → ∀𝑦𝑥𝑧 ∈ 𝒫 𝐴𝑤 ∈ 𝒫 𝐵(𝑦 ∈ (𝑧 × 𝑤) ∧ (𝑧 × 𝑤) ⊆ 𝑥)))
45 eltx 21494 . . . . 5 ((𝒫 𝐴 ∈ Top ∧ 𝒫 𝐵 ∈ Top) → (𝑥 ∈ (𝒫 𝐴 ×t 𝒫 𝐵) ↔ ∀𝑦𝑥𝑧 ∈ 𝒫 𝐴𝑤 ∈ 𝒫 𝐵(𝑦 ∈ (𝑧 × 𝑤) ∧ (𝑧 × 𝑤) ⊆ 𝑥)))
461, 2, 45syl2an 495 . . . 4 ((𝐴𝑉𝐵𝑊) → (𝑥 ∈ (𝒫 𝐴 ×t 𝒫 𝐵) ↔ ∀𝑦𝑥𝑧 ∈ 𝒫 𝐴𝑤 ∈ 𝒫 𝐵(𝑦 ∈ (𝑧 × 𝑤) ∧ (𝑧 × 𝑤) ⊆ 𝑥)))
4744, 46sylibrd 249 . . 3 ((𝐴𝑉𝐵𝑊) → (𝑥 ∈ 𝒫 (𝐴 × 𝐵) → 𝑥 ∈ (𝒫 𝐴 ×t 𝒫 𝐵)))
4847ssrdv 3715 . 2 ((𝐴𝑉𝐵𝑊) → 𝒫 (𝐴 × 𝐵) ⊆ (𝒫 𝐴 ×t 𝒫 𝐵))
4912, 48eqssd 3726 1 ((𝐴𝑉𝐵𝑊) → (𝒫 𝐴 ×t 𝒫 𝐵) = 𝒫 (𝐴 × 𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383   = wceq 1596  wcel 2103  wral 3014  wrex 3015  wss 3680  𝒫 cpw 4266  {csn 4285  cop 4291   cuni 4544   × cxp 5216  cfv 6001  (class class class)co 6765  1st c1st 7283  2nd c2nd 7284  Topctop 20821   ×t ctx 21486
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1835  ax-4 1850  ax-5 1952  ax-6 2018  ax-7 2054  ax-8 2105  ax-9 2112  ax-10 2132  ax-11 2147  ax-12 2160  ax-13 2355  ax-ext 2704  ax-sep 4889  ax-nul 4897  ax-pow 4948  ax-pr 5011  ax-un 7066
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1599  df-ex 1818  df-nf 1823  df-sb 2011  df-eu 2575  df-mo 2576  df-clab 2711  df-cleq 2717  df-clel 2720  df-nfc 2855  df-ne 2897  df-ral 3019  df-rex 3020  df-reu 3021  df-rab 3023  df-v 3306  df-sbc 3542  df-csb 3640  df-dif 3683  df-un 3685  df-in 3687  df-ss 3694  df-nul 4024  df-if 4195  df-pw 4268  df-sn 4286  df-pr 4288  df-op 4292  df-uni 4545  df-iun 4630  df-br 4761  df-opab 4821  df-mpt 4838  df-id 5128  df-xp 5224  df-rel 5225  df-cnv 5226  df-co 5227  df-dm 5228  df-rn 5229  df-res 5230  df-ima 5231  df-iota 5964  df-fun 6003  df-fn 6004  df-f 6005  df-f1 6006  df-fo 6007  df-f1o 6008  df-fv 6009  df-ov 6768  df-oprab 6769  df-mpt2 6770  df-1st 7285  df-2nd 7286  df-topgen 16227  df-top 20822  df-topon 20839  df-bases 20873  df-tx 21488
This theorem is referenced by:  distgp  22025
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