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Mirrors > Home > MPE Home > Th. List > txunii | Structured version Visualization version GIF version |
Description: The underlying set of the product of two topologies. (Contributed by Jeff Madsen, 15-Jun-2010.) |
Ref | Expression |
---|---|
txunii.1 | ⊢ 𝑅 ∈ Top |
txunii.2 | ⊢ 𝑆 ∈ Top |
txunii.3 | ⊢ 𝑋 = ∪ 𝑅 |
txunii.4 | ⊢ 𝑌 = ∪ 𝑆 |
Ref | Expression |
---|---|
txunii | ⊢ (𝑋 × 𝑌) = ∪ (𝑅 ×t 𝑆) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | txunii.1 | . 2 ⊢ 𝑅 ∈ Top | |
2 | txunii.2 | . 2 ⊢ 𝑆 ∈ Top | |
3 | txunii.3 | . . 3 ⊢ 𝑋 = ∪ 𝑅 | |
4 | txunii.4 | . . 3 ⊢ 𝑌 = ∪ 𝑆 | |
5 | 3, 4 | txuni 22197 | . 2 ⊢ ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑋 × 𝑌) = ∪ (𝑅 ×t 𝑆)) |
6 | 1, 2, 5 | mp2an 691 | 1 ⊢ (𝑋 × 𝑌) = ∪ (𝑅 ×t 𝑆) |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1538 ∈ wcel 2111 ∪ cuni 4800 × cxp 5517 (class class class)co 7135 Topctop 21498 ×t ctx 22165 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-op 4532 df-uni 4801 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-fv 6332 df-ov 7138 df-oprab 7139 df-mpo 7140 df-1st 7671 df-2nd 7672 df-topgen 16709 df-top 21499 df-topon 21516 df-bases 21551 df-tx 22167 |
This theorem is referenced by: txindis 22239 cxpcn3 25337 tpr2rico 31265 raddcn 31282 sxbrsigalem3 31640 dya2iocucvr 31652 sxbrsigalem1 31653 txsconnlem 32600 cvmlift2lem7 32669 cvmlift2lem9 32671 cvmlift2lem10 32672 cvmlift2lem12 32674 cvmlift2lem13 32675 cvmliftphtlem 32677 |
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