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Mirrors > Home > ILE Home > Th. List > txuni | GIF version |
Description: The underlying set of the product of two topologies. (Contributed by Jeff Madsen, 2-Sep-2009.) |
Ref | Expression |
---|---|
txuni.1 | ⊢ 𝑋 = ∪ 𝑅 |
txuni.2 | ⊢ 𝑌 = ∪ 𝑆 |
Ref | Expression |
---|---|
txuni | ⊢ ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑋 × 𝑌) = ∪ (𝑅 ×t 𝑆)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | txuni.1 | . . . 4 ⊢ 𝑋 = ∪ 𝑅 | |
2 | 1 | toptopon 12190 | . . 3 ⊢ (𝑅 ∈ Top ↔ 𝑅 ∈ (TopOn‘𝑋)) |
3 | txuni.2 | . . . 4 ⊢ 𝑌 = ∪ 𝑆 | |
4 | 3 | toptopon 12190 | . . 3 ⊢ (𝑆 ∈ Top ↔ 𝑆 ∈ (TopOn‘𝑌)) |
5 | txtopon 12436 | . . 3 ⊢ ((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) → (𝑅 ×t 𝑆) ∈ (TopOn‘(𝑋 × 𝑌))) | |
6 | 2, 4, 5 | syl2anb 289 | . 2 ⊢ ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑅 ×t 𝑆) ∈ (TopOn‘(𝑋 × 𝑌))) |
7 | toponuni 12187 | . 2 ⊢ ((𝑅 ×t 𝑆) ∈ (TopOn‘(𝑋 × 𝑌)) → (𝑋 × 𝑌) = ∪ (𝑅 ×t 𝑆)) | |
8 | 6, 7 | syl 14 | 1 ⊢ ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑋 × 𝑌) = ∪ (𝑅 ×t 𝑆)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 = wceq 1331 ∈ wcel 1480 ∪ cuni 3736 × cxp 4537 ‘cfv 5123 (class class class)co 5774 Topctop 12169 TopOnctopon 12182 ×t ctx 12426 |
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-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-coll 4043 ax-sep 4046 ax-pow 4098 ax-pr 4131 ax-un 4355 ax-setind 4452 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ne 2309 df-ral 2421 df-rex 2422 df-reu 2423 df-rab 2425 df-v 2688 df-sbc 2910 df-csb 3004 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-iun 3815 df-br 3930 df-opab 3990 df-mpt 3991 df-id 4215 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-rn 4550 df-res 4551 df-ima 4552 df-iota 5088 df-fun 5125 df-fn 5126 df-f 5127 df-f1 5128 df-fo 5129 df-f1o 5130 df-fv 5131 df-ov 5777 df-oprab 5778 df-mpo 5779 df-1st 6038 df-2nd 6039 df-topgen 12146 df-top 12170 df-topon 12183 df-bases 12215 df-tx 12427 |
This theorem is referenced by: txunii 12438 neitx 12442 uptx 12448 txcn 12449 txdis 12451 imasnopn 12473 |
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