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| Mirrors > Home > MPE Home > Th. List > txtopi | Structured version Visualization version GIF version | ||
| Description: The product of two topologies is a topology. (Contributed by Jeff Madsen, 15-Jun-2010.) |
| Ref | Expression |
|---|---|
| txtopi.1 | ⊢ 𝑅 ∈ Top |
| txtopi.2 | ⊢ 𝑆 ∈ Top |
| Ref | Expression |
|---|---|
| txtopi | ⊢ (𝑅 ×t 𝑆) ∈ Top |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | txtopi.1 | . 2 ⊢ 𝑅 ∈ Top | |
| 2 | txtopi.2 | . 2 ⊢ 𝑆 ∈ Top | |
| 3 | txtop 23522 | . 2 ⊢ ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑅 ×t 𝑆) ∈ Top) | |
| 4 | 1, 2, 3 | mp2an 693 | 1 ⊢ (𝑅 ×t 𝑆) ∈ Top |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 (class class class)co 7356 Topctop 22846 ×t ctx 23513 |
| 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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2184 ax-ext 2707 ax-sep 5220 ax-nul 5230 ax-pow 5296 ax-pr 5364 ax-un 7678 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2538 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2810 df-nfc 2884 df-ne 2931 df-ral 3050 df-rex 3060 df-rab 3388 df-v 3429 df-sbc 3726 df-csb 3834 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-nul 4264 df-if 4457 df-pw 4533 df-sn 4558 df-pr 4560 df-op 4564 df-uni 4841 df-iun 4925 df-br 5075 df-opab 5137 df-mpt 5156 df-id 5515 df-xp 5626 df-rel 5627 df-cnv 5628 df-co 5629 df-dm 5630 df-rn 5631 df-res 5632 df-ima 5633 df-iota 6443 df-fun 6489 df-fn 6490 df-f 6491 df-fv 6495 df-ov 7359 df-oprab 7360 df-mpo 7361 df-1st 7931 df-2nd 7932 df-topgen 17395 df-top 22847 df-bases 22899 df-tx 23515 |
| This theorem is referenced by: sxbrsigalem3 34404 dya2iocucvr 34416 cvmlift2lem9 35481 cvmlift2lem11 35483 cvmlift2lem12 35484 |
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