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Theorem txbasex 21778
Description: The basis for the product topology is a set. (Contributed by Mario Carneiro, 2-Sep-2015.)
Hypothesis
Ref Expression
txval.1 𝐵 = ran (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦))
Assertion
Ref Expression
txbasex ((𝑅𝑉𝑆𝑊) → 𝐵 ∈ V)
Distinct variable groups:   𝑥,𝑦,𝑅   𝑥,𝑆,𝑦
Allowed substitution hints:   𝐵(𝑥,𝑦)   𝑉(𝑥,𝑦)   𝑊(𝑥,𝑦)

Proof of Theorem txbasex
StepHypRef Expression
1 txval.1 . . . 4 𝐵 = ran (𝑥𝑅, 𝑦𝑆 ↦ (𝑥 × 𝑦))
2 eqid 2777 . . . 4 𝑅 = 𝑅
3 eqid 2777 . . . 4 𝑆 = 𝑆
41, 2, 3txuni2 21777 . . 3 ( 𝑅 × 𝑆) = 𝐵
5 uniexg 7232 . . . 4 (𝑅𝑉 𝑅 ∈ V)
6 uniexg 7232 . . . 4 (𝑆𝑊 𝑆 ∈ V)
7 xpexg 7237 . . . 4 (( 𝑅 ∈ V ∧ 𝑆 ∈ V) → ( 𝑅 × 𝑆) ∈ V)
85, 6, 7syl2an 589 . . 3 ((𝑅𝑉𝑆𝑊) → ( 𝑅 × 𝑆) ∈ V)
94, 8syl5eqelr 2863 . 2 ((𝑅𝑉𝑆𝑊) → 𝐵 ∈ V)
10 uniexb 7250 . 2 (𝐵 ∈ V ↔ 𝐵 ∈ V)
119, 10sylibr 226 1 ((𝑅𝑉𝑆𝑊) → 𝐵 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 386   = wceq 1601  wcel 2106  Vcvv 3397   cuni 4671   × cxp 5353  ran crn 5356  cmpt2 6924
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1839  ax-4 1853  ax-5 1953  ax-6 2021  ax-7 2054  ax-8 2108  ax-9 2115  ax-10 2134  ax-11 2149  ax-12 2162  ax-13 2333  ax-ext 2753  ax-sep 5017  ax-nul 5025  ax-pow 5077  ax-pr 5138  ax-un 7226
This theorem depends on definitions:  df-bi 199  df-an 387  df-or 837  df-3an 1073  df-tru 1605  df-ex 1824  df-nf 1828  df-sb 2012  df-mo 2550  df-eu 2586  df-clab 2763  df-cleq 2769  df-clel 2773  df-nfc 2920  df-ne 2969  df-ral 3094  df-rex 3095  df-rab 3098  df-v 3399  df-sbc 3652  df-csb 3751  df-dif 3794  df-un 3796  df-in 3798  df-ss 3805  df-nul 4141  df-if 4307  df-pw 4380  df-sn 4398  df-pr 4400  df-op 4404  df-uni 4672  df-iun 4755  df-br 4887  df-opab 4949  df-mpt 4966  df-id 5261  df-xp 5361  df-rel 5362  df-cnv 5363  df-co 5364  df-dm 5365  df-rn 5366  df-res 5367  df-ima 5368  df-iota 6099  df-fun 6137  df-fn 6138  df-f 6139  df-fv 6143  df-oprab 6926  df-mpt2 6927  df-1st 7445  df-2nd 7446
This theorem is referenced by:  txbas  21779  eltx  21780  txtopon  21803  txopn  21814  txss12  21817  txbasval  21818  txrest  21843  sxsiga  30852  elsx  30855  mbfmco2  30925
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