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Mirrors > Home > ILE Home > Th. List > txvalex | GIF version |
Description: Existence of the binary topological product. If 𝑅 and 𝑆 are known to be topologies, see txtop 14212. (Contributed by Jim Kingdon, 3-Aug-2023.) |
Ref | Expression |
---|---|
txvalex | ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → (𝑅 ×t 𝑆) ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex 2763 | . . . 4 ⊢ (𝑅 ∈ 𝑉 → 𝑅 ∈ V) | |
2 | 1 | adantr 276 | . . 3 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → 𝑅 ∈ V) |
3 | elex 2763 | . . . 4 ⊢ (𝑆 ∈ 𝑊 → 𝑆 ∈ V) | |
4 | 3 | adantl 277 | . . 3 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → 𝑆 ∈ V) |
5 | mpoexga 6236 | . . . 4 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦)) ∈ V) | |
6 | rnexg 4910 | . . . 4 ⊢ ((𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦)) ∈ V → ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦)) ∈ V) | |
7 | tgvalex 12765 | . . . 4 ⊢ (ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦)) ∈ V → (topGen‘ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦))) ∈ V) | |
8 | 5, 6, 7 | 3syl 17 | . . 3 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → (topGen‘ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦))) ∈ V) |
9 | mpoeq12 5955 | . . . . . 6 ⊢ ((𝑤 = 𝑅 ∧ 𝑧 = 𝑆) → (𝑥 ∈ 𝑤, 𝑦 ∈ 𝑧 ↦ (𝑥 × 𝑦)) = (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦))) | |
10 | 9 | rneqd 4874 | . . . . 5 ⊢ ((𝑤 = 𝑅 ∧ 𝑧 = 𝑆) → ran (𝑥 ∈ 𝑤, 𝑦 ∈ 𝑧 ↦ (𝑥 × 𝑦)) = ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦))) |
11 | 10 | fveq2d 5538 | . . . 4 ⊢ ((𝑤 = 𝑅 ∧ 𝑧 = 𝑆) → (topGen‘ran (𝑥 ∈ 𝑤, 𝑦 ∈ 𝑧 ↦ (𝑥 × 𝑦))) = (topGen‘ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦)))) |
12 | df-tx 14205 | . . . 4 ⊢ ×t = (𝑤 ∈ V, 𝑧 ∈ V ↦ (topGen‘ran (𝑥 ∈ 𝑤, 𝑦 ∈ 𝑧 ↦ (𝑥 × 𝑦)))) | |
13 | 11, 12 | ovmpoga 6025 | . . 3 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V ∧ (topGen‘ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦))) ∈ V) → (𝑅 ×t 𝑆) = (topGen‘ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦)))) |
14 | 2, 4, 8, 13 | syl3anc 1249 | . 2 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → (𝑅 ×t 𝑆) = (topGen‘ran (𝑥 ∈ 𝑅, 𝑦 ∈ 𝑆 ↦ (𝑥 × 𝑦)))) |
15 | 14, 8 | eqeltrd 2266 | 1 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝑆 ∈ 𝑊) → (𝑅 ×t 𝑆) ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 104 = wceq 1364 ∈ wcel 2160 Vcvv 2752 × cxp 4642 ran crn 4645 ‘cfv 5235 (class class class)co 5895 ∈ cmpo 5897 topGenctg 12756 ×t ctx 14204 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2162 ax-14 2163 ax-ext 2171 ax-coll 4133 ax-sep 4136 ax-pow 4192 ax-pr 4227 ax-un 4451 ax-setind 4554 |
This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2041 df-mo 2042 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-ne 2361 df-ral 2473 df-rex 2474 df-reu 2475 df-rab 2477 df-v 2754 df-sbc 2978 df-csb 3073 df-dif 3146 df-un 3148 df-in 3150 df-ss 3157 df-pw 3592 df-sn 3613 df-pr 3614 df-op 3616 df-uni 3825 df-iun 3903 df-br 4019 df-opab 4080 df-mpt 4081 df-id 4311 df-xp 4650 df-rel 4651 df-cnv 4652 df-co 4653 df-dm 4654 df-rn 4655 df-res 4656 df-ima 4657 df-iota 5196 df-fun 5237 df-fn 5238 df-f 5239 df-f1 5240 df-fo 5241 df-f1o 5242 df-fv 5243 df-ov 5898 df-oprab 5899 df-mpo 5900 df-1st 6164 df-2nd 6165 df-topgen 12762 df-tx 14205 |
This theorem is referenced by: txbasval 14219 |
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