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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 23556 | . 2 ⊢ ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑅 ×t 𝑆) ∈ Top) | |
| 4 | 1, 2, 3 | mp2an 699 | 1 ⊢ (𝑅 ×t 𝑆) ∈ Top |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2121 (class class class)co 7360 Topctop 22880 ×t ctx 23547 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-10 2154 ax-11 2170 ax-12 2191 ax-ext 2713 ax-sep 5221 ax-nul 5231 ax-pow 5297 ax-pr 5365 ax-un 7682 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-nf 1792 df-sb 2075 df-mo 2545 df-eu 2575 df-clab 2720 df-cleq 2733 df-clel 2816 df-nfc 2890 df-ne 2937 df-ral 3056 df-rex 3066 df-rab 3394 df-v 3435 df-sbc 3726 df-csb 3834 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-nul 4265 df-if 4458 df-pw 4534 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4842 df-iun 4926 df-br 5076 df-opab 5138 df-mpt 5157 df-id 5516 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-iota 6445 df-fun 6491 df-fn 6492 df-f 6493 df-fv 6497 df-ov 7363 df-oprab 7364 df-mpo 7365 df-1st 7935 df-2nd 7936 df-topgen 17401 df-top 22881 df-bases 22933 df-tx 23549 |
| This theorem is referenced by: sxbrsigalem3 34468 dya2iocucvr 34480 cvmlift2lem9 35554 cvmlift2lem11 35556 cvmlift2lem12 35557 |
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