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Theorem txuni2 21291
 Description: The underlying set of the product of two topologies. (Contributed by Mario Carneiro, 31-Aug-2015.)
Hypotheses
Ref Expression
txval.1 𝐵 = ran (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦))
txuni2.1 𝑋 = 𝑅
txuni2.2 𝑌 = 𝑆
Assertion
Ref Expression
txuni2 (𝑋 × 𝑌) = 𝐵
Distinct variable groups:   𝑥,𝑦,𝑅   𝑥,𝑆,𝑦   𝑥,𝑋,𝑦   𝑥,𝑌,𝑦
Allowed substitution hints:   𝐵(𝑥,𝑦)

Proof of Theorem txuni2
Dummy variables 𝑟 𝑠 𝑧 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 relxp 5193 . . 3 Rel (𝑋 × 𝑌)
2 txuni2.1 . . . . . . . 8 𝑋 = 𝑅
32eleq2i 2690 . . . . . . 7 (𝑧𝑋𝑧 𝑅)
4 eluni2 4411 . . . . . . 7 (𝑧 𝑅 ↔ ∃𝑟𝑅 𝑧𝑟)
53, 4bitri 264 . . . . . 6 (𝑧𝑋 ↔ ∃𝑟𝑅 𝑧𝑟)
6 txuni2.2 . . . . . . . 8 𝑌 = 𝑆
76eleq2i 2690 . . . . . . 7 (𝑤𝑌𝑤 𝑆)
8 eluni2 4411 . . . . . . 7 (𝑤 𝑆 ↔ ∃𝑠𝑆 𝑤𝑠)
97, 8bitri 264 . . . . . 6 (𝑤𝑌 ↔ ∃𝑠𝑆 𝑤𝑠)
105, 9anbi12i 732 . . . . 5 ((𝑧𝑋𝑤𝑌) ↔ (∃𝑟𝑅 𝑧𝑟 ∧ ∃𝑠𝑆 𝑤𝑠))
11 opelxp 5111 . . . . 5 (⟨𝑧, 𝑤⟩ ∈ (𝑋 × 𝑌) ↔ (𝑧𝑋𝑤𝑌))
12 reeanv 3100 . . . . 5 (∃𝑟𝑅𝑠𝑆 (𝑧𝑟𝑤𝑠) ↔ (∃𝑟𝑅 𝑧𝑟 ∧ ∃𝑠𝑆 𝑤𝑠))
1310, 11, 123bitr4i 292 . . . 4 (⟨𝑧, 𝑤⟩ ∈ (𝑋 × 𝑌) ↔ ∃𝑟𝑅𝑠𝑆 (𝑧𝑟𝑤𝑠))
14 opelxp 5111 . . . . . 6 (⟨𝑧, 𝑤⟩ ∈ (𝑟 × 𝑠) ↔ (𝑧𝑟𝑤𝑠))
15 eqid 2621 . . . . . . . . . 10 (𝑟 × 𝑠) = (𝑟 × 𝑠)
16 xpeq1 5093 . . . . . . . . . . . 12 (𝑥 = 𝑟 → (𝑥 × 𝑦) = (𝑟 × 𝑦))
1716eqeq2d 2631 . . . . . . . . . . 11 (𝑥 = 𝑟 → ((𝑟 × 𝑠) = (𝑥 × 𝑦) ↔ (𝑟 × 𝑠) = (𝑟 × 𝑦)))
18 xpeq2 5094 . . . . . . . . . . . 12 (𝑦 = 𝑠 → (𝑟 × 𝑦) = (𝑟 × 𝑠))
1918eqeq2d 2631 . . . . . . . . . . 11 (𝑦 = 𝑠 → ((𝑟 × 𝑠) = (𝑟 × 𝑦) ↔ (𝑟 × 𝑠) = (𝑟 × 𝑠)))
2017, 19rspc2ev 3312 . . . . . . . . . 10 ((𝑟𝑅𝑠𝑆 ∧ (𝑟 × 𝑠) = (𝑟 × 𝑠)) → ∃𝑥𝑅𝑦𝑆 (𝑟 × 𝑠) = (𝑥 × 𝑦))
2115, 20mp3an3 1410 . . . . . . . . 9 ((𝑟𝑅𝑠𝑆) → ∃𝑥𝑅𝑦𝑆 (𝑟 × 𝑠) = (𝑥 × 𝑦))
22 vex 3192 . . . . . . . . . . 11 𝑟 ∈ V
23 vex 3192 . . . . . . . . . . 11 𝑠 ∈ V
2422, 23xpex 6922 . . . . . . . . . 10 (𝑟 × 𝑠) ∈ V
25 eqeq1 2625 . . . . . . . . . . 11 (𝑧 = (𝑟 × 𝑠) → (𝑧 = (𝑥 × 𝑦) ↔ (𝑟 × 𝑠) = (𝑥 × 𝑦)))
26252rexbidv 3051 . . . . . . . . . 10 (𝑧 = (𝑟 × 𝑠) → (∃𝑥𝑅𝑦𝑆 𝑧 = (𝑥 × 𝑦) ↔ ∃𝑥𝑅𝑦𝑆 (𝑟 × 𝑠) = (𝑥 × 𝑦)))
27 txval.1 . . . . . . . . . . 11 𝐵 = ran (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦))
28 eqid 2621 . . . . . . . . . . . 12 (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦)) = (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦))
2928rnmpt2 6730 . . . . . . . . . . 11 ran (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦)) = {𝑧 ∣ ∃𝑥𝑅𝑦𝑆 𝑧 = (𝑥 × 𝑦)}
3027, 29eqtri 2643 . . . . . . . . . 10 𝐵 = {𝑧 ∣ ∃𝑥𝑅𝑦𝑆 𝑧 = (𝑥 × 𝑦)}
3124, 26, 30elab2 3341 . . . . . . . . 9 ((𝑟 × 𝑠) ∈ 𝐵 ↔ ∃𝑥𝑅𝑦𝑆 (𝑟 × 𝑠) = (𝑥 × 𝑦))
3221, 31sylibr 224 . . . . . . . 8 ((𝑟𝑅𝑠𝑆) → (𝑟 × 𝑠) ∈ 𝐵)
33 elssuni 4438 . . . . . . . 8 ((𝑟 × 𝑠) ∈ 𝐵 → (𝑟 × 𝑠) ⊆ 𝐵)
3432, 33syl 17 . . . . . . 7 ((𝑟𝑅𝑠𝑆) → (𝑟 × 𝑠) ⊆ 𝐵)
3534sseld 3586 . . . . . 6 ((𝑟𝑅𝑠𝑆) → (⟨𝑧, 𝑤⟩ ∈ (𝑟 × 𝑠) → ⟨𝑧, 𝑤⟩ ∈ 𝐵))
3614, 35syl5bir 233 . . . . 5 ((𝑟𝑅𝑠𝑆) → ((𝑧𝑟𝑤𝑠) → ⟨𝑧, 𝑤⟩ ∈ 𝐵))
3736rexlimivv 3030 . . . 4 (∃𝑟𝑅𝑠𝑆 (𝑧𝑟𝑤𝑠) → ⟨𝑧, 𝑤⟩ ∈ 𝐵)
3813, 37sylbi 207 . . 3 (⟨𝑧, 𝑤⟩ ∈ (𝑋 × 𝑌) → ⟨𝑧, 𝑤⟩ ∈ 𝐵)
391, 38relssi 5177 . 2 (𝑋 × 𝑌) ⊆ 𝐵
40 elssuni 4438 . . . . . . . . . 10 (𝑥𝑅𝑥 𝑅)
4140, 2syl6sseqr 3636 . . . . . . . . 9 (𝑥𝑅𝑥𝑋)
42 elssuni 4438 . . . . . . . . . 10 (𝑦𝑆𝑦 𝑆)
4342, 6syl6sseqr 3636 . . . . . . . . 9 (𝑦𝑆𝑦𝑌)
44 xpss12 5191 . . . . . . . . 9 ((𝑥𝑋𝑦𝑌) → (𝑥 × 𝑦) ⊆ (𝑋 × 𝑌))
4541, 43, 44syl2an 494 . . . . . . . 8 ((𝑥𝑅𝑦𝑆) → (𝑥 × 𝑦) ⊆ (𝑋 × 𝑌))
46 vex 3192 . . . . . . . . . 10 𝑥 ∈ V
47 vex 3192 . . . . . . . . . 10 𝑦 ∈ V
4846, 47xpex 6922 . . . . . . . . 9 (𝑥 × 𝑦) ∈ V
4948elpw 4141 . . . . . . . 8 ((𝑥 × 𝑦) ∈ 𝒫 (𝑋 × 𝑌) ↔ (𝑥 × 𝑦) ⊆ (𝑋 × 𝑌))
5045, 49sylibr 224 . . . . . . 7 ((𝑥𝑅𝑦𝑆) → (𝑥 × 𝑦) ∈ 𝒫 (𝑋 × 𝑌))
5150rgen2 2970 . . . . . 6 𝑥𝑅𝑦𝑆 (𝑥 × 𝑦) ∈ 𝒫 (𝑋 × 𝑌)
5228fmpt2 7189 . . . . . 6 (∀𝑥𝑅𝑦𝑆 (𝑥 × 𝑦) ∈ 𝒫 (𝑋 × 𝑌) ↔ (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦)):(𝑅 × 𝑆)⟶𝒫 (𝑋 × 𝑌))
5351, 52mpbi 220 . . . . 5 (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦)):(𝑅 × 𝑆)⟶𝒫 (𝑋 × 𝑌)
54 frn 6015 . . . . 5 ((𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦)):(𝑅 × 𝑆)⟶𝒫 (𝑋 × 𝑌) → ran (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦)) ⊆ 𝒫 (𝑋 × 𝑌))
5553, 54ax-mp 5 . . . 4 ran (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦)) ⊆ 𝒫 (𝑋 × 𝑌)
5627, 55eqsstri 3619 . . 3 𝐵 ⊆ 𝒫 (𝑋 × 𝑌)
57 sspwuni 4582 . . 3 (𝐵 ⊆ 𝒫 (𝑋 × 𝑌) ↔ 𝐵 ⊆ (𝑋 × 𝑌))
5856, 57mpbi 220 . 2 𝐵 ⊆ (𝑋 × 𝑌)
5939, 58eqssi 3603 1 (𝑋 × 𝑌) = 𝐵
 Colors of variables: wff setvar class Syntax hints:   ∧ wa 384   = wceq 1480   ∈ wcel 1987  {cab 2607  ∀wral 2907  ∃wrex 2908   ⊆ wss 3559  𝒫 cpw 4135  ⟨cop 4159  ∪ cuni 4407   × cxp 5077  ran crn 5080  ⟶wf 5848   ↦ cmpt2 6612 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6909 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2912  df-rex 2913  df-rab 2916  df-v 3191  df-sbc 3422  df-csb 3519  df-dif 3562  df-un 3564  df-in 3566  df-ss 3573  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-op 4160  df-uni 4408  df-iun 4492  df-br 4619  df-opab 4679  df-mpt 4680  df-id 4994  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-iota 5815  df-fun 5854  df-fn 5855  df-f 5856  df-fv 5860  df-oprab 6614  df-mpt2 6615  df-1st 7120  df-2nd 7121 This theorem is referenced by:  txbasex  21292  txtopon  21317  sxsigon  30060
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