Theorem txbasex 15341

Description: The basis for the product topology is a set. (Contributed by Mario Carneiro, 2-Sep-2015.)

Hypothesis

Ref	Expression
txval.1	⊢ 𝐵 = ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦))

Assertion

Ref	Expression
txbasex	⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → 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

Step	Hyp	Ref	Expression
1		txval.1	. . . 4 ⊢ 𝐵 = ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦))
2		eqid 2238	. . . 4 ⊢ ∪ 𝑅 = ∪ 𝑅
3		eqid 2238	. . . 4 ⊢ ∪ 𝑆 = ∪ 𝑆
4	1, 2, 3	txuni2 15340	. . 3 ⊢ (∪ 𝑅 × ∪ 𝑆) = ∪ 𝐵
5		uniexg 4583	. . . 4 ⊢ (𝑅 ∈ 𝑉 → ∪ 𝑅 ∈ V)
6		uniexg 4583	. . . 4 ⊢ (𝑆 ∈ 𝑊 → ∪ 𝑆 ∈ V)
7		xpexg 4887	. . . 4 ⊢ ((∪ 𝑅 ∈ V ∧ ∪ 𝑆 ∈ V) → (∪ 𝑅 × ∪ 𝑆) ∈ V)
8	5, 6, 7	syl2an 289	. . 3 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → (∪ 𝑅 × ∪ 𝑆) ∈ V)
9	4, 8	eqeltrrid 2326	. 2 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → ∪ 𝐵 ∈ V)
10		uniexb 4617	. 2 ⊢ (𝐵 ∈ V ↔ ∪ 𝐵 ∈ V)
11	9, 10	sylibr 134	1 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → 𝐵 ∈ V)

Syntax hints:   → wi 4   ∧ wa 104   = wceq 1402   ∈ wcel 2209  Vcvv 2821  ∪ cuni 3933   × cxp 4770  ran crn 4773   ∈ cmpo 6081

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4247  ax-pow 4309  ax-pr 4344  ax-un 4576

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-iun 4012  df-br 4129  df-opab 4191  df-mpt 4192  df-id 4436  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-fv 5383  df-oprab 6083  df-mpo 6084  df-1st 6368  df-2nd 6369

This theorem is referenced by:  txbas  15342  eltx  15343  txtopon  15346  txopn  15349  txss12  15350  txbasval  15351  txrest  15360