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Theorem tx1cn 12497
 Description: Continuity of the first projection map of a topological product. (Contributed by Jeff Madsen, 2-Sep-2009.) (Proof shortened by Mario Carneiro, 22-Aug-2015.)
Assertion
Ref Expression
tx1cn ((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) → (1st ↾ (𝑋 × 𝑌)) ∈ ((𝑅 ×t 𝑆) Cn 𝑅))

Proof of Theorem tx1cn
Dummy variables 𝑤 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 f1stres 6066 . . 3 (1st ↾ (𝑋 × 𝑌)):(𝑋 × 𝑌)⟶𝑋
21a1i 9 . 2 ((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) → (1st ↾ (𝑋 × 𝑌)):(𝑋 × 𝑌)⟶𝑋)
3 ffn 5281 . . . . . . . 8 ((1st ↾ (𝑋 × 𝑌)):(𝑋 × 𝑌)⟶𝑋 → (1st ↾ (𝑋 × 𝑌)) Fn (𝑋 × 𝑌))
4 elpreima 5548 . . . . . . . 8 ((1st ↾ (𝑋 × 𝑌)) Fn (𝑋 × 𝑌) → (𝑧 ∈ ((1st ↾ (𝑋 × 𝑌)) “ 𝑤) ↔ (𝑧 ∈ (𝑋 × 𝑌) ∧ ((1st ↾ (𝑋 × 𝑌))‘𝑧) ∈ 𝑤)))
51, 3, 4mp2b 8 . . . . . . 7 (𝑧 ∈ ((1st ↾ (𝑋 × 𝑌)) “ 𝑤) ↔ (𝑧 ∈ (𝑋 × 𝑌) ∧ ((1st ↾ (𝑋 × 𝑌))‘𝑧) ∈ 𝑤))
6 fvres 5454 . . . . . . . . . 10 (𝑧 ∈ (𝑋 × 𝑌) → ((1st ↾ (𝑋 × 𝑌))‘𝑧) = (1st𝑧))
76eleq1d 2209 . . . . . . . . 9 (𝑧 ∈ (𝑋 × 𝑌) → (((1st ↾ (𝑋 × 𝑌))‘𝑧) ∈ 𝑤 ↔ (1st𝑧) ∈ 𝑤))
8 1st2nd2 6082 . . . . . . . . . 10 (𝑧 ∈ (𝑋 × 𝑌) → 𝑧 = ⟨(1st𝑧), (2nd𝑧)⟩)
9 xp2nd 6073 . . . . . . . . . 10 (𝑧 ∈ (𝑋 × 𝑌) → (2nd𝑧) ∈ 𝑌)
10 elxp6 6076 . . . . . . . . . . . 12 (𝑧 ∈ (𝑤 × 𝑌) ↔ (𝑧 = ⟨(1st𝑧), (2nd𝑧)⟩ ∧ ((1st𝑧) ∈ 𝑤 ∧ (2nd𝑧) ∈ 𝑌)))
11 anass 399 . . . . . . . . . . . 12 (((𝑧 = ⟨(1st𝑧), (2nd𝑧)⟩ ∧ (1st𝑧) ∈ 𝑤) ∧ (2nd𝑧) ∈ 𝑌) ↔ (𝑧 = ⟨(1st𝑧), (2nd𝑧)⟩ ∧ ((1st𝑧) ∈ 𝑤 ∧ (2nd𝑧) ∈ 𝑌)))
12 an32 552 . . . . . . . . . . . 12 (((𝑧 = ⟨(1st𝑧), (2nd𝑧)⟩ ∧ (1st𝑧) ∈ 𝑤) ∧ (2nd𝑧) ∈ 𝑌) ↔ ((𝑧 = ⟨(1st𝑧), (2nd𝑧)⟩ ∧ (2nd𝑧) ∈ 𝑌) ∧ (1st𝑧) ∈ 𝑤))
1310, 11, 123bitr2i 207 . . . . . . . . . . 11 (𝑧 ∈ (𝑤 × 𝑌) ↔ ((𝑧 = ⟨(1st𝑧), (2nd𝑧)⟩ ∧ (2nd𝑧) ∈ 𝑌) ∧ (1st𝑧) ∈ 𝑤))
1413baib 905 . . . . . . . . . 10 ((𝑧 = ⟨(1st𝑧), (2nd𝑧)⟩ ∧ (2nd𝑧) ∈ 𝑌) → (𝑧 ∈ (𝑤 × 𝑌) ↔ (1st𝑧) ∈ 𝑤))
158, 9, 14syl2anc 409 . . . . . . . . 9 (𝑧 ∈ (𝑋 × 𝑌) → (𝑧 ∈ (𝑤 × 𝑌) ↔ (1st𝑧) ∈ 𝑤))
167, 15bitr4d 190 . . . . . . . 8 (𝑧 ∈ (𝑋 × 𝑌) → (((1st ↾ (𝑋 × 𝑌))‘𝑧) ∈ 𝑤𝑧 ∈ (𝑤 × 𝑌)))
1716pm5.32i 450 . . . . . . 7 ((𝑧 ∈ (𝑋 × 𝑌) ∧ ((1st ↾ (𝑋 × 𝑌))‘𝑧) ∈ 𝑤) ↔ (𝑧 ∈ (𝑋 × 𝑌) ∧ 𝑧 ∈ (𝑤 × 𝑌)))
185, 17bitri 183 . . . . . 6 (𝑧 ∈ ((1st ↾ (𝑋 × 𝑌)) “ 𝑤) ↔ (𝑧 ∈ (𝑋 × 𝑌) ∧ 𝑧 ∈ (𝑤 × 𝑌)))
19 toponss 12252 . . . . . . . . . 10 ((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑤𝑅) → 𝑤𝑋)
2019adantlr 469 . . . . . . . . 9 (((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ 𝑤𝑅) → 𝑤𝑋)
21 xpss1 4658 . . . . . . . . 9 (𝑤𝑋 → (𝑤 × 𝑌) ⊆ (𝑋 × 𝑌))
2220, 21syl 14 . . . . . . . 8 (((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ 𝑤𝑅) → (𝑤 × 𝑌) ⊆ (𝑋 × 𝑌))
2322sseld 3102 . . . . . . 7 (((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ 𝑤𝑅) → (𝑧 ∈ (𝑤 × 𝑌) → 𝑧 ∈ (𝑋 × 𝑌)))
2423pm4.71rd 392 . . . . . 6 (((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ 𝑤𝑅) → (𝑧 ∈ (𝑤 × 𝑌) ↔ (𝑧 ∈ (𝑋 × 𝑌) ∧ 𝑧 ∈ (𝑤 × 𝑌))))
2518, 24bitr4id 198 . . . . 5 (((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ 𝑤𝑅) → (𝑧 ∈ ((1st ↾ (𝑋 × 𝑌)) “ 𝑤) ↔ 𝑧 ∈ (𝑤 × 𝑌)))
2625eqrdv 2138 . . . 4 (((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ 𝑤𝑅) → ((1st ↾ (𝑋 × 𝑌)) “ 𝑤) = (𝑤 × 𝑌))
27 toponmax 12251 . . . . . 6 (𝑆 ∈ (TopOn‘𝑌) → 𝑌𝑆)
2827ad2antlr 481 . . . . 5 (((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ 𝑤𝑅) → 𝑌𝑆)
29 txopn 12493 . . . . . 6 (((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ (𝑤𝑅𝑌𝑆)) → (𝑤 × 𝑌) ∈ (𝑅 ×t 𝑆))
3029anassrs 398 . . . . 5 ((((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ 𝑤𝑅) ∧ 𝑌𝑆) → (𝑤 × 𝑌) ∈ (𝑅 ×t 𝑆))
3128, 30mpdan 418 . . . 4 (((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ 𝑤𝑅) → (𝑤 × 𝑌) ∈ (𝑅 ×t 𝑆))
3226, 31eqeltrd 2217 . . 3 (((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) ∧ 𝑤𝑅) → ((1st ↾ (𝑋 × 𝑌)) “ 𝑤) ∈ (𝑅 ×t 𝑆))
3332ralrimiva 2509 . 2 ((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) → ∀𝑤𝑅 ((1st ↾ (𝑋 × 𝑌)) “ 𝑤) ∈ (𝑅 ×t 𝑆))
34 txtopon 12490 . . 3 ((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) → (𝑅 ×t 𝑆) ∈ (TopOn‘(𝑋 × 𝑌)))
35 simpl 108 . . 3 ((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) → 𝑅 ∈ (TopOn‘𝑋))
36 iscn 12425 . . 3 (((𝑅 ×t 𝑆) ∈ (TopOn‘(𝑋 × 𝑌)) ∧ 𝑅 ∈ (TopOn‘𝑋)) → ((1st ↾ (𝑋 × 𝑌)) ∈ ((𝑅 ×t 𝑆) Cn 𝑅) ↔ ((1st ↾ (𝑋 × 𝑌)):(𝑋 × 𝑌)⟶𝑋 ∧ ∀𝑤𝑅 ((1st ↾ (𝑋 × 𝑌)) “ 𝑤) ∈ (𝑅 ×t 𝑆))))
3734, 35, 36syl2anc 409 . 2 ((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) → ((1st ↾ (𝑋 × 𝑌)) ∈ ((𝑅 ×t 𝑆) Cn 𝑅) ↔ ((1st ↾ (𝑋 × 𝑌)):(𝑋 × 𝑌)⟶𝑋 ∧ ∀𝑤𝑅 ((1st ↾ (𝑋 × 𝑌)) “ 𝑤) ∈ (𝑅 ×t 𝑆))))
382, 33, 37mpbir2and 929 1 ((𝑅 ∈ (TopOn‘𝑋) ∧ 𝑆 ∈ (TopOn‘𝑌)) → (1st ↾ (𝑋 × 𝑌)) ∈ ((𝑅 ×t 𝑆) Cn 𝑅))
 Colors of variables: wff set class Syntax hints:   → wi 4   ∧ wa 103   ↔ wb 104   = wceq 1332   ∈ wcel 1481  ∀wral 2417   ⊆ wss 3077  ⟨cop 3536   × cxp 4546  ◡ccnv 4547   ↾ cres 4550   “ cima 4551   Fn wfn 5127  ⟶wf 5128  ‘cfv 5132  (class class class)co 5783  1st c1st 6045  2nd c2nd 6046  TopOnctopon 12236   Cn ccn 12413   ×t ctx 12480 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 604  ax-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-13 1492  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-coll 4052  ax-sep 4055  ax-pow 4107  ax-pr 4140  ax-un 4364  ax-setind 4461 This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1335  df-fal 1338  df-nf 1438  df-sb 1737  df-eu 2003  df-mo 2004  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ne 2310  df-ral 2422  df-rex 2423  df-reu 2424  df-rab 2426  df-v 2692  df-sbc 2915  df-csb 3009  df-dif 3079  df-un 3081  df-in 3083  df-ss 3090  df-pw 3518  df-sn 3539  df-pr 3540  df-op 3542  df-uni 3746  df-iun 3824  df-br 3939  df-opab 3999  df-mpt 4000  df-id 4224  df-xp 4554  df-rel 4555  df-cnv 4556  df-co 4557  df-dm 4558  df-rn 4559  df-res 4560  df-ima 4561  df-iota 5097  df-fun 5134  df-fn 5135  df-f 5136  df-f1 5137  df-fo 5138  df-f1o 5139  df-fv 5140  df-ov 5786  df-oprab 5787  df-mpo 5788  df-1st 6047  df-2nd 6048  df-map 6553  df-topgen 12200  df-top 12224  df-topon 12237  df-bases 12269  df-cn 12416  df-tx 12481 This theorem is referenced by:  txcn  12503  cnmpt1st  12516
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