![]() |
Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
|
Mirrors > Home > ILE Home > Th. List > txbasex | GIF version |
Description: The basis for the product topology is a set. (Contributed by Mario Carneiro, 2-Sep-2015.) |
Ref | Expression |
---|---|
txval.1 | ⊢ 𝐵 = ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦)) |
Ref | Expression |
---|---|
txbasex | ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → 𝐵 ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | txval.1 | . . . 4 ⊢ 𝐵 = ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦)) | |
2 | eqid 2140 | . . . 4 ⊢ ∪ 𝑅 = ∪ 𝑅 | |
3 | eqid 2140 | . . . 4 ⊢ ∪ 𝑆 = ∪ 𝑆 | |
4 | 1, 2, 3 | txuni2 12464 | . . 3 ⊢ (∪ 𝑅 × ∪ 𝑆) = ∪ 𝐵 |
5 | uniexg 4369 | . . . 4 ⊢ (𝑅 ∈ 𝑉 → ∪ 𝑅 ∈ V) | |
6 | uniexg 4369 | . . . 4 ⊢ (𝑆 ∈ 𝑊 → ∪ 𝑆 ∈ V) | |
7 | xpexg 4661 | . . . 4 ⊢ ((∪ 𝑅 ∈ V ∧ ∪ 𝑆 ∈ V) → (∪ 𝑅 × ∪ 𝑆) ∈ V) | |
8 | 5, 6, 7 | syl2an 287 | . . 3 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → (∪ 𝑅 × ∪ 𝑆) ∈ V) |
9 | 4, 8 | eqeltrrid 2228 | . 2 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → ∪ 𝐵 ∈ V) |
10 | uniexb 4402 | . 2 ⊢ (𝐵 ∈ V ↔ ∪ 𝐵 ∈ V) | |
11 | 9, 10 | sylibr 133 | 1 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → 𝐵 ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 = wceq 1332 ∈ wcel 1481 Vcvv 2689 ∪ cuni 3744 × cxp 4545 ran crn 4548 ∈ cmpo 5784 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 ax-pr 4139 ax-un 4363 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ral 2422 df-rex 2423 df-rab 2426 df-v 2691 df-sbc 2914 df-csb 3008 df-un 3080 df-in 3082 df-ss 3089 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-iun 3823 df-br 3938 df-opab 3998 df-mpt 3999 df-id 4223 df-xp 4553 df-rel 4554 df-cnv 4555 df-co 4556 df-dm 4557 df-rn 4558 df-res 4559 df-ima 4560 df-iota 5096 df-fun 5133 df-fn 5134 df-f 5135 df-fv 5139 df-oprab 5786 df-mpo 5787 df-1st 6046 df-2nd 6047 |
This theorem is referenced by: txbas 12466 eltx 12467 txtopon 12470 txopn 12473 txss12 12474 txbasval 12475 txrest 12484 |
Copyright terms: Public domain | W3C validator |