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Theorem txcnmpt 21662
Description: A map into the product of two topological spaces is continuous if both of its projections are continuous. (Contributed by Jeff Madsen, 2-Sep-2009.) (Revised by Mario Carneiro, 22-Aug-2015.)
Hypotheses
Ref Expression
txcnmpt.1 𝑊 = 𝑈
txcnmpt.2 𝐻 = (𝑥𝑊 ↦ ⟨(𝐹𝑥), (𝐺𝑥)⟩)
Assertion
Ref Expression
txcnmpt ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → 𝐻 ∈ (𝑈 Cn (𝑅 ×t 𝑆)))
Distinct variable groups:   𝑥,𝐹   𝑥,𝐺   𝑥,𝑅   𝑥,𝑆   𝑥,𝑈   𝑥,𝑊
Allowed substitution hint:   𝐻(𝑥)

Proof of Theorem txcnmpt
Dummy variables 𝑠 𝑟 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 txcnmpt.1 . . . . . . 7 𝑊 = 𝑈
2 eqid 2817 . . . . . . 7 𝑅 = 𝑅
31, 2cnf 21285 . . . . . 6 (𝐹 ∈ (𝑈 Cn 𝑅) → 𝐹:𝑊 𝑅)
43adantr 468 . . . . 5 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → 𝐹:𝑊 𝑅)
54ffvelrnda 6591 . . . 4 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ 𝑥𝑊) → (𝐹𝑥) ∈ 𝑅)
6 eqid 2817 . . . . . . 7 𝑆 = 𝑆
71, 6cnf 21285 . . . . . 6 (𝐺 ∈ (𝑈 Cn 𝑆) → 𝐺:𝑊 𝑆)
87adantl 469 . . . . 5 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → 𝐺:𝑊 𝑆)
98ffvelrnda 6591 . . . 4 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ 𝑥𝑊) → (𝐺𝑥) ∈ 𝑆)
10 opelxpi 5360 . . . 4 (((𝐹𝑥) ∈ 𝑅 ∧ (𝐺𝑥) ∈ 𝑆) → ⟨(𝐹𝑥), (𝐺𝑥)⟩ ∈ ( 𝑅 × 𝑆))
115, 9, 10syl2anc 575 . . 3 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ 𝑥𝑊) → ⟨(𝐹𝑥), (𝐺𝑥)⟩ ∈ ( 𝑅 × 𝑆))
12 txcnmpt.2 . . 3 𝐻 = (𝑥𝑊 ↦ ⟨(𝐹𝑥), (𝐺𝑥)⟩)
1311, 12fmptd 6616 . 2 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → 𝐻:𝑊⟶( 𝑅 × 𝑆))
1412mptpreima 5856 . . . . . 6 (𝐻 “ (𝑟 × 𝑠)) = {𝑥𝑊 ∣ ⟨(𝐹𝑥), (𝐺𝑥)⟩ ∈ (𝑟 × 𝑠)}
154adantr 468 . . . . . . . . . . . . 13 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → 𝐹:𝑊 𝑅)
1615adantr 468 . . . . . . . . . . . 12 ((((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) ∧ 𝑥𝑊) → 𝐹:𝑊 𝑅)
17 ffn 6266 . . . . . . . . . . . 12 (𝐹:𝑊 𝑅𝐹 Fn 𝑊)
18 elpreima 6569 . . . . . . . . . . . 12 (𝐹 Fn 𝑊 → (𝑥 ∈ (𝐹𝑟) ↔ (𝑥𝑊 ∧ (𝐹𝑥) ∈ 𝑟)))
1916, 17, 183syl 18 . . . . . . . . . . 11 ((((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) ∧ 𝑥𝑊) → (𝑥 ∈ (𝐹𝑟) ↔ (𝑥𝑊 ∧ (𝐹𝑥) ∈ 𝑟)))
20 ibar 520 . . . . . . . . . . . 12 (𝑥𝑊 → ((𝐹𝑥) ∈ 𝑟 ↔ (𝑥𝑊 ∧ (𝐹𝑥) ∈ 𝑟)))
2120adantl 469 . . . . . . . . . . 11 ((((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) ∧ 𝑥𝑊) → ((𝐹𝑥) ∈ 𝑟 ↔ (𝑥𝑊 ∧ (𝐹𝑥) ∈ 𝑟)))
2219, 21bitr4d 273 . . . . . . . . . 10 ((((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) ∧ 𝑥𝑊) → (𝑥 ∈ (𝐹𝑟) ↔ (𝐹𝑥) ∈ 𝑟))
238ad2antrr 708 . . . . . . . . . . . 12 ((((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) ∧ 𝑥𝑊) → 𝐺:𝑊 𝑆)
24 ffn 6266 . . . . . . . . . . . 12 (𝐺:𝑊 𝑆𝐺 Fn 𝑊)
25 elpreima 6569 . . . . . . . . . . . 12 (𝐺 Fn 𝑊 → (𝑥 ∈ (𝐺𝑠) ↔ (𝑥𝑊 ∧ (𝐺𝑥) ∈ 𝑠)))
2623, 24, 253syl 18 . . . . . . . . . . 11 ((((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) ∧ 𝑥𝑊) → (𝑥 ∈ (𝐺𝑠) ↔ (𝑥𝑊 ∧ (𝐺𝑥) ∈ 𝑠)))
27 ibar 520 . . . . . . . . . . . 12 (𝑥𝑊 → ((𝐺𝑥) ∈ 𝑠 ↔ (𝑥𝑊 ∧ (𝐺𝑥) ∈ 𝑠)))
2827adantl 469 . . . . . . . . . . 11 ((((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) ∧ 𝑥𝑊) → ((𝐺𝑥) ∈ 𝑠 ↔ (𝑥𝑊 ∧ (𝐺𝑥) ∈ 𝑠)))
2926, 28bitr4d 273 . . . . . . . . . 10 ((((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) ∧ 𝑥𝑊) → (𝑥 ∈ (𝐺𝑠) ↔ (𝐺𝑥) ∈ 𝑠))
3022, 29anbi12d 618 . . . . . . . . 9 ((((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) ∧ 𝑥𝑊) → ((𝑥 ∈ (𝐹𝑟) ∧ 𝑥 ∈ (𝐺𝑠)) ↔ ((𝐹𝑥) ∈ 𝑟 ∧ (𝐺𝑥) ∈ 𝑠)))
31 elin 4006 . . . . . . . . 9 (𝑥 ∈ ((𝐹𝑟) ∩ (𝐺𝑠)) ↔ (𝑥 ∈ (𝐹𝑟) ∧ 𝑥 ∈ (𝐺𝑠)))
32 opelxp 5359 . . . . . . . . 9 (⟨(𝐹𝑥), (𝐺𝑥)⟩ ∈ (𝑟 × 𝑠) ↔ ((𝐹𝑥) ∈ 𝑟 ∧ (𝐺𝑥) ∈ 𝑠))
3330, 31, 323bitr4g 305 . . . . . . . 8 ((((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) ∧ 𝑥𝑊) → (𝑥 ∈ ((𝐹𝑟) ∩ (𝐺𝑠)) ↔ ⟨(𝐹𝑥), (𝐺𝑥)⟩ ∈ (𝑟 × 𝑠)))
3433rabbi2dva 4029 . . . . . . 7 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → (𝑊 ∩ ((𝐹𝑟) ∩ (𝐺𝑠))) = {𝑥𝑊 ∣ ⟨(𝐹𝑥), (𝐺𝑥)⟩ ∈ (𝑟 × 𝑠)})
35 inss1 4040 . . . . . . . . . 10 ((𝐹𝑟) ∩ (𝐺𝑠)) ⊆ (𝐹𝑟)
36 cnvimass 5709 . . . . . . . . . 10 (𝐹𝑟) ⊆ dom 𝐹
3735, 36sstri 3818 . . . . . . . . 9 ((𝐹𝑟) ∩ (𝐺𝑠)) ⊆ dom 𝐹
3837, 15fssdm 6282 . . . . . . . 8 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → ((𝐹𝑟) ∩ (𝐺𝑠)) ⊆ 𝑊)
39 sseqin2 4027 . . . . . . . 8 (((𝐹𝑟) ∩ (𝐺𝑠)) ⊆ 𝑊 ↔ (𝑊 ∩ ((𝐹𝑟) ∩ (𝐺𝑠))) = ((𝐹𝑟) ∩ (𝐺𝑠)))
4038, 39sylib 209 . . . . . . 7 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → (𝑊 ∩ ((𝐹𝑟) ∩ (𝐺𝑠))) = ((𝐹𝑟) ∩ (𝐺𝑠)))
4134, 40eqtr3d 2853 . . . . . 6 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → {𝑥𝑊 ∣ ⟨(𝐹𝑥), (𝐺𝑥)⟩ ∈ (𝑟 × 𝑠)} = ((𝐹𝑟) ∩ (𝐺𝑠)))
4214, 41syl5eq 2863 . . . . 5 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → (𝐻 “ (𝑟 × 𝑠)) = ((𝐹𝑟) ∩ (𝐺𝑠)))
43 cntop1 21279 . . . . . . . 8 (𝐺 ∈ (𝑈 Cn 𝑆) → 𝑈 ∈ Top)
4443adantl 469 . . . . . . 7 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → 𝑈 ∈ Top)
4544adantr 468 . . . . . 6 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → 𝑈 ∈ Top)
46 cnima 21304 . . . . . . 7 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝑟𝑅) → (𝐹𝑟) ∈ 𝑈)
4746ad2ant2r 744 . . . . . 6 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → (𝐹𝑟) ∈ 𝑈)
48 cnima 21304 . . . . . . 7 ((𝐺 ∈ (𝑈 Cn 𝑆) ∧ 𝑠𝑆) → (𝐺𝑠) ∈ 𝑈)
4948ad2ant2l 743 . . . . . 6 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → (𝐺𝑠) ∈ 𝑈)
50 inopn 20938 . . . . . 6 ((𝑈 ∈ Top ∧ (𝐹𝑟) ∈ 𝑈 ∧ (𝐺𝑠) ∈ 𝑈) → ((𝐹𝑟) ∩ (𝐺𝑠)) ∈ 𝑈)
5145, 47, 49, 50syl3anc 1483 . . . . 5 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → ((𝐹𝑟) ∩ (𝐺𝑠)) ∈ 𝑈)
5242, 51eqeltrd 2896 . . . 4 (((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) ∧ (𝑟𝑅𝑠𝑆)) → (𝐻 “ (𝑟 × 𝑠)) ∈ 𝑈)
5352ralrimivva 3170 . . 3 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → ∀𝑟𝑅𝑠𝑆 (𝐻 “ (𝑟 × 𝑠)) ∈ 𝑈)
54 vex 3405 . . . . . 6 𝑟 ∈ V
55 vex 3405 . . . . . 6 𝑠 ∈ V
5654, 55xpex 7202 . . . . 5 (𝑟 × 𝑠) ∈ V
5756rgen2w 3124 . . . 4 𝑟𝑅𝑠𝑆 (𝑟 × 𝑠) ∈ V
58 eqid 2817 . . . . 5 (𝑟𝑅, 𝑠𝑆 ↦ (𝑟 × 𝑠)) = (𝑟𝑅, 𝑠𝑆 ↦ (𝑟 × 𝑠))
59 imaeq2 5686 . . . . . 6 (𝑧 = (𝑟 × 𝑠) → (𝐻𝑧) = (𝐻 “ (𝑟 × 𝑠)))
6059eleq1d 2881 . . . . 5 (𝑧 = (𝑟 × 𝑠) → ((𝐻𝑧) ∈ 𝑈 ↔ (𝐻 “ (𝑟 × 𝑠)) ∈ 𝑈))
6158, 60ralrnmpt2 7015 . . . 4 (∀𝑟𝑅𝑠𝑆 (𝑟 × 𝑠) ∈ V → (∀𝑧 ∈ ran (𝑟𝑅, 𝑠𝑆 ↦ (𝑟 × 𝑠))(𝐻𝑧) ∈ 𝑈 ↔ ∀𝑟𝑅𝑠𝑆 (𝐻 “ (𝑟 × 𝑠)) ∈ 𝑈))
6257, 61ax-mp 5 . . 3 (∀𝑧 ∈ ran (𝑟𝑅, 𝑠𝑆 ↦ (𝑟 × 𝑠))(𝐻𝑧) ∈ 𝑈 ↔ ∀𝑟𝑅𝑠𝑆 (𝐻 “ (𝑟 × 𝑠)) ∈ 𝑈)
6353, 62sylibr 225 . 2 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → ∀𝑧 ∈ ran (𝑟𝑅, 𝑠𝑆 ↦ (𝑟 × 𝑠))(𝐻𝑧) ∈ 𝑈)
641toptopon 20956 . . . 4 (𝑈 ∈ Top ↔ 𝑈 ∈ (TopOn‘𝑊))
6544, 64sylib 209 . . 3 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → 𝑈 ∈ (TopOn‘𝑊))
66 cntop2 21280 . . . 4 (𝐹 ∈ (𝑈 Cn 𝑅) → 𝑅 ∈ Top)
67 cntop2 21280 . . . 4 (𝐺 ∈ (𝑈 Cn 𝑆) → 𝑆 ∈ Top)
68 eqid 2817 . . . . 5 ran (𝑟𝑅, 𝑠𝑆 ↦ (𝑟 × 𝑠)) = ran (𝑟𝑅, 𝑠𝑆 ↦ (𝑟 × 𝑠))
6968txval 21602 . . . 4 ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑅 ×t 𝑆) = (topGen‘ran (𝑟𝑅, 𝑠𝑆 ↦ (𝑟 × 𝑠))))
7066, 67, 69syl2an 585 . . 3 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → (𝑅 ×t 𝑆) = (topGen‘ran (𝑟𝑅, 𝑠𝑆 ↦ (𝑟 × 𝑠))))
712toptopon 20956 . . . . 5 (𝑅 ∈ Top ↔ 𝑅 ∈ (TopOn‘ 𝑅))
7266, 71sylib 209 . . . 4 (𝐹 ∈ (𝑈 Cn 𝑅) → 𝑅 ∈ (TopOn‘ 𝑅))
736toptopon 20956 . . . . 5 (𝑆 ∈ Top ↔ 𝑆 ∈ (TopOn‘ 𝑆))
7467, 73sylib 209 . . . 4 (𝐺 ∈ (𝑈 Cn 𝑆) → 𝑆 ∈ (TopOn‘ 𝑆))
75 txtopon 21629 . . . 4 ((𝑅 ∈ (TopOn‘ 𝑅) ∧ 𝑆 ∈ (TopOn‘ 𝑆)) → (𝑅 ×t 𝑆) ∈ (TopOn‘( 𝑅 × 𝑆)))
7672, 74, 75syl2an 585 . . 3 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → (𝑅 ×t 𝑆) ∈ (TopOn‘( 𝑅 × 𝑆)))
7765, 70, 76tgcn 21291 . 2 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → (𝐻 ∈ (𝑈 Cn (𝑅 ×t 𝑆)) ↔ (𝐻:𝑊⟶( 𝑅 × 𝑆) ∧ ∀𝑧 ∈ ran (𝑟𝑅, 𝑠𝑆 ↦ (𝑟 × 𝑠))(𝐻𝑧) ∈ 𝑈)))
7813, 63, 77mpbir2and 695 1 ((𝐹 ∈ (𝑈 Cn 𝑅) ∧ 𝐺 ∈ (𝑈 Cn 𝑆)) → 𝐻 ∈ (𝑈 Cn (𝑅 ×t 𝑆)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 197  wa 384   = wceq 1637  wcel 2157  wral 3107  {crab 3111  Vcvv 3402  cin 3779  wss 3780  cop 4387   cuni 4641  cmpt 4934   × cxp 5322  ccnv 5323  dom cdm 5324  ran crn 5325  cima 5327   Fn wfn 6106  wf 6107  cfv 6111  (class class class)co 6884  cmpt2 6886  topGenctg 16323  Topctop 20932  TopOnctopon 20949   Cn ccn 21263   ×t ctx 21598
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1877  ax-4 1894  ax-5 2001  ax-6 2069  ax-7 2105  ax-8 2159  ax-9 2166  ax-10 2186  ax-11 2202  ax-12 2215  ax-13 2422  ax-ext 2795  ax-sep 4988  ax-nul 4996  ax-pow 5048  ax-pr 5109  ax-un 7189
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 866  df-3an 1102  df-tru 1641  df-ex 1860  df-nf 1864  df-sb 2062  df-mo 2635  df-eu 2642  df-clab 2804  df-cleq 2810  df-clel 2813  df-nfc 2948  df-ne 2990  df-ral 3112  df-rex 3113  df-rab 3116  df-v 3404  df-sbc 3645  df-csb 3740  df-dif 3783  df-un 3785  df-in 3787  df-ss 3794  df-nul 4128  df-if 4291  df-pw 4364  df-sn 4382  df-pr 4384  df-op 4388  df-uni 4642  df-iun 4725  df-br 4856  df-opab 4918  df-mpt 4935  df-id 5232  df-xp 5330  df-rel 5331  df-cnv 5332  df-co 5333  df-dm 5334  df-rn 5335  df-res 5336  df-ima 5337  df-iota 6074  df-fun 6113  df-fn 6114  df-f 6115  df-fv 6119  df-ov 6887  df-oprab 6888  df-mpt2 6889  df-1st 7408  df-2nd 7409  df-map 8104  df-topgen 16329  df-top 20933  df-topon 20950  df-bases 20985  df-cn 21266  df-tx 21600
This theorem is referenced by:  uptx  21663  hauseqlcld  21684  txkgen  21690  cnmpt1t  21703  cnmpt2t  21711  txpconn  31559
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