Theorem txbasex 22176

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 2823	. . . 4 ⊢ ∪ 𝑅 = ∪ 𝑅
3		eqid 2823	. . . 4 ⊢ ∪ 𝑆 = ∪ 𝑆
4	1, 2, 3	txuni2 22175	. . 3 ⊢ (∪ 𝑅 × ∪ 𝑆) = ∪ 𝐵
5		uniexg 7468	. . . 4 ⊢ (𝑅 ∈ 𝑉 → ∪ 𝑅 ∈ V)
6		uniexg 7468	. . . 4 ⊢ (𝑆 ∈ 𝑊 → ∪ 𝑆 ∈ V)
7		xpexg 7475	. . . 4 ⊢ ((∪ 𝑅 ∈ V ∧ ∪ 𝑆 ∈ V) → (∪ 𝑅 × ∪ 𝑆) ∈ V)
8	5, 6, 7	syl2an 597	. . 3 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → (∪ 𝑅 × ∪ 𝑆) ∈ V)
9	4, 8	eqeltrrid 2920	. 2 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → ∪ 𝐵 ∈ V)
10		uniexb 7488	. 2 ⊢ (𝐵 ∈ V ↔ ∪ 𝐵 ∈ V)
11	9, 10	sylibr 236	1 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → 𝐵 ∈ V)

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537   ∈ wcel 2114  Vcvv 3496  ∪ cuni 4840   × cxp 5555  ran crn 5558   ∈ cmpo 7160

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ne 3019  df-ral 3145  df-rex 3146  df-rab 3149  df-v 3498  df-sbc 3775  df-csb 3886  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-pw 4543  df-sn 4570  df-pr 4572  df-op 4576  df-uni 4841  df-iun 4923  df-br 5069  df-opab 5131  df-mpt 5149  df-id 5462  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-res 5569  df-ima 5570  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-fv 6365  df-oprab 7162  df-mpo 7163  df-1st 7691  df-2nd 7692

This theorem is referenced by:  txbas  22177  eltx  22178  txtopon  22201  txopn  22212  txss12  22215  txbasval  22216  txrest  22241  sxsiga  31452  elsx  31455  mbfmco2  31525