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Theorem cnmpt2t 21854
 Description: The composition of continuous functions is continuous. (Contributed by Mario Carneiro, 5-May-2014.) (Revised by Mario Carneiro, 22-Aug-2015.)
Hypotheses
Ref Expression
cnmpt21.j (𝜑𝐽 ∈ (TopOn‘𝑋))
cnmpt21.k (𝜑𝐾 ∈ (TopOn‘𝑌))
cnmpt21.a (𝜑 → (𝑥𝑋, 𝑦𝑌𝐴) ∈ ((𝐽 ×t 𝐾) Cn 𝐿))
cnmpt2t.b (𝜑 → (𝑥𝑋, 𝑦𝑌𝐵) ∈ ((𝐽 ×t 𝐾) Cn 𝑀))
Assertion
Ref Expression
cnmpt2t (𝜑 → (𝑥𝑋, 𝑦𝑌 ↦ ⟨𝐴, 𝐵⟩) ∈ ((𝐽 ×t 𝐾) Cn (𝐿 ×t 𝑀)))
Distinct variable groups:   𝑥,𝑦,𝐿   𝜑,𝑥,𝑦   𝑥,𝑋,𝑦   𝑥,𝑀,𝑦   𝑥,𝑌,𝑦
Allowed substitution hints:   𝐴(𝑥,𝑦)   𝐵(𝑥,𝑦)   𝐽(𝑥,𝑦)   𝐾(𝑥,𝑦)

Proof of Theorem cnmpt2t
Dummy variables 𝑣 𝑢 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fveq2 6437 . . . . . . 7 (𝑧 = ⟨𝑢, 𝑣⟩ → ((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧) = ((𝑥𝑋, 𝑦𝑌𝐴)‘⟨𝑢, 𝑣⟩))
2 df-ov 6913 . . . . . . 7 (𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣) = ((𝑥𝑋, 𝑦𝑌𝐴)‘⟨𝑢, 𝑣⟩)
31, 2syl6eqr 2879 . . . . . 6 (𝑧 = ⟨𝑢, 𝑣⟩ → ((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧) = (𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣))
4 fveq2 6437 . . . . . . 7 (𝑧 = ⟨𝑢, 𝑣⟩ → ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧) = ((𝑥𝑋, 𝑦𝑌𝐵)‘⟨𝑢, 𝑣⟩))
5 df-ov 6913 . . . . . . 7 (𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣) = ((𝑥𝑋, 𝑦𝑌𝐵)‘⟨𝑢, 𝑣⟩)
64, 5syl6eqr 2879 . . . . . 6 (𝑧 = ⟨𝑢, 𝑣⟩ → ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧) = (𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣))
73, 6opeq12d 4633 . . . . 5 (𝑧 = ⟨𝑢, 𝑣⟩ → ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩ = ⟨(𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣), (𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣)⟩)
87mpt2mpt 7017 . . . 4 (𝑧 ∈ (𝑋 × 𝑌) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩) = (𝑢𝑋, 𝑣𝑌 ↦ ⟨(𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣), (𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣)⟩)
9 nfcv 2969 . . . . . . 7 𝑥𝑢
10 nfmpt21 6987 . . . . . . 7 𝑥(𝑥𝑋, 𝑦𝑌𝐴)
11 nfcv 2969 . . . . . . 7 𝑥𝑣
129, 10, 11nfov 6940 . . . . . 6 𝑥(𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣)
13 nfmpt21 6987 . . . . . . 7 𝑥(𝑥𝑋, 𝑦𝑌𝐵)
149, 13, 11nfov 6940 . . . . . 6 𝑥(𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣)
1512, 14nfop 4641 . . . . 5 𝑥⟨(𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣), (𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣)⟩
16 nfcv 2969 . . . . . . 7 𝑦𝑢
17 nfmpt22 6988 . . . . . . 7 𝑦(𝑥𝑋, 𝑦𝑌𝐴)
18 nfcv 2969 . . . . . . 7 𝑦𝑣
1916, 17, 18nfov 6940 . . . . . 6 𝑦(𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣)
20 nfmpt22 6988 . . . . . . 7 𝑦(𝑥𝑋, 𝑦𝑌𝐵)
2116, 20, 18nfov 6940 . . . . . 6 𝑦(𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣)
2219, 21nfop 4641 . . . . 5 𝑦⟨(𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣), (𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣)⟩
23 nfcv 2969 . . . . 5 𝑢⟨(𝑥(𝑥𝑋, 𝑦𝑌𝐴)𝑦), (𝑥(𝑥𝑋, 𝑦𝑌𝐵)𝑦)⟩
24 nfcv 2969 . . . . 5 𝑣⟨(𝑥(𝑥𝑋, 𝑦𝑌𝐴)𝑦), (𝑥(𝑥𝑋, 𝑦𝑌𝐵)𝑦)⟩
25 oveq12 6919 . . . . . 6 ((𝑢 = 𝑥𝑣 = 𝑦) → (𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣) = (𝑥(𝑥𝑋, 𝑦𝑌𝐴)𝑦))
26 oveq12 6919 . . . . . 6 ((𝑢 = 𝑥𝑣 = 𝑦) → (𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣) = (𝑥(𝑥𝑋, 𝑦𝑌𝐵)𝑦))
2725, 26opeq12d 4633 . . . . 5 ((𝑢 = 𝑥𝑣 = 𝑦) → ⟨(𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣), (𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣)⟩ = ⟨(𝑥(𝑥𝑋, 𝑦𝑌𝐴)𝑦), (𝑥(𝑥𝑋, 𝑦𝑌𝐵)𝑦)⟩)
2815, 22, 23, 24, 27cbvmpt2 6999 . . . 4 (𝑢𝑋, 𝑣𝑌 ↦ ⟨(𝑢(𝑥𝑋, 𝑦𝑌𝐴)𝑣), (𝑢(𝑥𝑋, 𝑦𝑌𝐵)𝑣)⟩) = (𝑥𝑋, 𝑦𝑌 ↦ ⟨(𝑥(𝑥𝑋, 𝑦𝑌𝐴)𝑦), (𝑥(𝑥𝑋, 𝑦𝑌𝐵)𝑦)⟩)
298, 28eqtri 2849 . . 3 (𝑧 ∈ (𝑋 × 𝑌) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩) = (𝑥𝑋, 𝑦𝑌 ↦ ⟨(𝑥(𝑥𝑋, 𝑦𝑌𝐴)𝑦), (𝑥(𝑥𝑋, 𝑦𝑌𝐵)𝑦)⟩)
30 cnmpt21.j . . . . 5 (𝜑𝐽 ∈ (TopOn‘𝑋))
31 cnmpt21.k . . . . 5 (𝜑𝐾 ∈ (TopOn‘𝑌))
32 txtopon 21772 . . . . 5 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐾 ∈ (TopOn‘𝑌)) → (𝐽 ×t 𝐾) ∈ (TopOn‘(𝑋 × 𝑌)))
3330, 31, 32syl2anc 579 . . . 4 (𝜑 → (𝐽 ×t 𝐾) ∈ (TopOn‘(𝑋 × 𝑌)))
34 toponuni 21096 . . . 4 ((𝐽 ×t 𝐾) ∈ (TopOn‘(𝑋 × 𝑌)) → (𝑋 × 𝑌) = (𝐽 ×t 𝐾))
35 mpteq1 4962 . . . 4 ((𝑋 × 𝑌) = (𝐽 ×t 𝐾) → (𝑧 ∈ (𝑋 × 𝑌) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩) = (𝑧 (𝐽 ×t 𝐾) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩))
3633, 34, 353syl 18 . . 3 (𝜑 → (𝑧 ∈ (𝑋 × 𝑌) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩) = (𝑧 (𝐽 ×t 𝐾) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩))
37 simp2 1171 . . . . . 6 ((𝜑𝑥𝑋𝑦𝑌) → 𝑥𝑋)
38 simp3 1172 . . . . . 6 ((𝜑𝑥𝑋𝑦𝑌) → 𝑦𝑌)
39 cnmpt21.a . . . . . . . . . . . 12 (𝜑 → (𝑥𝑋, 𝑦𝑌𝐴) ∈ ((𝐽 ×t 𝐾) Cn 𝐿))
40 cntop2 21423 . . . . . . . . . . . 12 ((𝑥𝑋, 𝑦𝑌𝐴) ∈ ((𝐽 ×t 𝐾) Cn 𝐿) → 𝐿 ∈ Top)
4139, 40syl 17 . . . . . . . . . . 11 (𝜑𝐿 ∈ Top)
42 eqid 2825 . . . . . . . . . . . 12 𝐿 = 𝐿
4342toptopon 21099 . . . . . . . . . . 11 (𝐿 ∈ Top ↔ 𝐿 ∈ (TopOn‘ 𝐿))
4441, 43sylib 210 . . . . . . . . . 10 (𝜑𝐿 ∈ (TopOn‘ 𝐿))
45 cnf2 21431 . . . . . . . . . 10 (((𝐽 ×t 𝐾) ∈ (TopOn‘(𝑋 × 𝑌)) ∧ 𝐿 ∈ (TopOn‘ 𝐿) ∧ (𝑥𝑋, 𝑦𝑌𝐴) ∈ ((𝐽 ×t 𝐾) Cn 𝐿)) → (𝑥𝑋, 𝑦𝑌𝐴):(𝑋 × 𝑌)⟶ 𝐿)
4633, 44, 39, 45syl3anc 1494 . . . . . . . . 9 (𝜑 → (𝑥𝑋, 𝑦𝑌𝐴):(𝑋 × 𝑌)⟶ 𝐿)
47 eqid 2825 . . . . . . . . . 10 (𝑥𝑋, 𝑦𝑌𝐴) = (𝑥𝑋, 𝑦𝑌𝐴)
4847fmpt2 7505 . . . . . . . . 9 (∀𝑥𝑋𝑦𝑌 𝐴 𝐿 ↔ (𝑥𝑋, 𝑦𝑌𝐴):(𝑋 × 𝑌)⟶ 𝐿)
4946, 48sylibr 226 . . . . . . . 8 (𝜑 → ∀𝑥𝑋𝑦𝑌 𝐴 𝐿)
50 rsp2 3145 . . . . . . . 8 (∀𝑥𝑋𝑦𝑌 𝐴 𝐿 → ((𝑥𝑋𝑦𝑌) → 𝐴 𝐿))
5149, 50syl 17 . . . . . . 7 (𝜑 → ((𝑥𝑋𝑦𝑌) → 𝐴 𝐿))
52513impib 1148 . . . . . 6 ((𝜑𝑥𝑋𝑦𝑌) → 𝐴 𝐿)
5347ovmpt4g 7048 . . . . . 6 ((𝑥𝑋𝑦𝑌𝐴 𝐿) → (𝑥(𝑥𝑋, 𝑦𝑌𝐴)𝑦) = 𝐴)
5437, 38, 52, 53syl3anc 1494 . . . . 5 ((𝜑𝑥𝑋𝑦𝑌) → (𝑥(𝑥𝑋, 𝑦𝑌𝐴)𝑦) = 𝐴)
55 cnmpt2t.b . . . . . . . . . . . 12 (𝜑 → (𝑥𝑋, 𝑦𝑌𝐵) ∈ ((𝐽 ×t 𝐾) Cn 𝑀))
56 cntop2 21423 . . . . . . . . . . . 12 ((𝑥𝑋, 𝑦𝑌𝐵) ∈ ((𝐽 ×t 𝐾) Cn 𝑀) → 𝑀 ∈ Top)
5755, 56syl 17 . . . . . . . . . . 11 (𝜑𝑀 ∈ Top)
58 eqid 2825 . . . . . . . . . . . 12 𝑀 = 𝑀
5958toptopon 21099 . . . . . . . . . . 11 (𝑀 ∈ Top ↔ 𝑀 ∈ (TopOn‘ 𝑀))
6057, 59sylib 210 . . . . . . . . . 10 (𝜑𝑀 ∈ (TopOn‘ 𝑀))
61 cnf2 21431 . . . . . . . . . 10 (((𝐽 ×t 𝐾) ∈ (TopOn‘(𝑋 × 𝑌)) ∧ 𝑀 ∈ (TopOn‘ 𝑀) ∧ (𝑥𝑋, 𝑦𝑌𝐵) ∈ ((𝐽 ×t 𝐾) Cn 𝑀)) → (𝑥𝑋, 𝑦𝑌𝐵):(𝑋 × 𝑌)⟶ 𝑀)
6233, 60, 55, 61syl3anc 1494 . . . . . . . . 9 (𝜑 → (𝑥𝑋, 𝑦𝑌𝐵):(𝑋 × 𝑌)⟶ 𝑀)
63 eqid 2825 . . . . . . . . . 10 (𝑥𝑋, 𝑦𝑌𝐵) = (𝑥𝑋, 𝑦𝑌𝐵)
6463fmpt2 7505 . . . . . . . . 9 (∀𝑥𝑋𝑦𝑌 𝐵 𝑀 ↔ (𝑥𝑋, 𝑦𝑌𝐵):(𝑋 × 𝑌)⟶ 𝑀)
6562, 64sylibr 226 . . . . . . . 8 (𝜑 → ∀𝑥𝑋𝑦𝑌 𝐵 𝑀)
66 rsp2 3145 . . . . . . . 8 (∀𝑥𝑋𝑦𝑌 𝐵 𝑀 → ((𝑥𝑋𝑦𝑌) → 𝐵 𝑀))
6765, 66syl 17 . . . . . . 7 (𝜑 → ((𝑥𝑋𝑦𝑌) → 𝐵 𝑀))
68673impib 1148 . . . . . 6 ((𝜑𝑥𝑋𝑦𝑌) → 𝐵 𝑀)
6963ovmpt4g 7048 . . . . . 6 ((𝑥𝑋𝑦𝑌𝐵 𝑀) → (𝑥(𝑥𝑋, 𝑦𝑌𝐵)𝑦) = 𝐵)
7037, 38, 68, 69syl3anc 1494 . . . . 5 ((𝜑𝑥𝑋𝑦𝑌) → (𝑥(𝑥𝑋, 𝑦𝑌𝐵)𝑦) = 𝐵)
7154, 70opeq12d 4633 . . . 4 ((𝜑𝑥𝑋𝑦𝑌) → ⟨(𝑥(𝑥𝑋, 𝑦𝑌𝐴)𝑦), (𝑥(𝑥𝑋, 𝑦𝑌𝐵)𝑦)⟩ = ⟨𝐴, 𝐵⟩)
7271mpt2eq3dva 6984 . . 3 (𝜑 → (𝑥𝑋, 𝑦𝑌 ↦ ⟨(𝑥(𝑥𝑋, 𝑦𝑌𝐴)𝑦), (𝑥(𝑥𝑋, 𝑦𝑌𝐵)𝑦)⟩) = (𝑥𝑋, 𝑦𝑌 ↦ ⟨𝐴, 𝐵⟩))
7329, 36, 723eqtr3a 2885 . 2 (𝜑 → (𝑧 (𝐽 ×t 𝐾) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩) = (𝑥𝑋, 𝑦𝑌 ↦ ⟨𝐴, 𝐵⟩))
74 eqid 2825 . . . 4 (𝐽 ×t 𝐾) = (𝐽 ×t 𝐾)
75 eqid 2825 . . . 4 (𝑧 (𝐽 ×t 𝐾) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩) = (𝑧 (𝐽 ×t 𝐾) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩)
7674, 75txcnmpt 21805 . . 3 (((𝑥𝑋, 𝑦𝑌𝐴) ∈ ((𝐽 ×t 𝐾) Cn 𝐿) ∧ (𝑥𝑋, 𝑦𝑌𝐵) ∈ ((𝐽 ×t 𝐾) Cn 𝑀)) → (𝑧 (𝐽 ×t 𝐾) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩) ∈ ((𝐽 ×t 𝐾) Cn (𝐿 ×t 𝑀)))
7739, 55, 76syl2anc 579 . 2 (𝜑 → (𝑧 (𝐽 ×t 𝐾) ↦ ⟨((𝑥𝑋, 𝑦𝑌𝐴)‘𝑧), ((𝑥𝑋, 𝑦𝑌𝐵)‘𝑧)⟩) ∈ ((𝐽 ×t 𝐾) Cn (𝐿 ×t 𝑀)))
7873, 77eqeltrrd 2907 1 (𝜑 → (𝑥𝑋, 𝑦𝑌 ↦ ⟨𝐴, 𝐵⟩) ∈ ((𝐽 ×t 𝐾) Cn (𝐿 ×t 𝑀)))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 386   ∧ w3a 1111   = wceq 1656   ∈ wcel 2164  ∀wral 3117  ⟨cop 4405  ∪ cuni 4660   ↦ cmpt 4954   × cxp 5344  ⟶wf 6123  ‘cfv 6127  (class class class)co 6910   ↦ cmpt2 6912  Topctop 21075  TopOnctopon 21092   Cn ccn 21406   ×t ctx 21741 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1894  ax-4 1908  ax-5 2009  ax-6 2075  ax-7 2112  ax-8 2166  ax-9 2173  ax-10 2192  ax-11 2207  ax-12 2220  ax-13 2389  ax-ext 2803  ax-sep 5007  ax-nul 5015  ax-pow 5067  ax-pr 5129  ax-un 7214 This theorem depends on definitions:  df-bi 199  df-an 387  df-or 879  df-3an 1113  df-tru 1660  df-ex 1879  df-nf 1883  df-sb 2068  df-mo 2605  df-eu 2640  df-clab 2812  df-cleq 2818  df-clel 2821  df-nfc 2958  df-ne 3000  df-ral 3122  df-rex 3123  df-rab 3126  df-v 3416  df-sbc 3663  df-csb 3758  df-dif 3801  df-un 3803  df-in 3805  df-ss 3812  df-nul 4147  df-if 4309  df-pw 4382  df-sn 4400  df-pr 4402  df-op 4406  df-uni 4661  df-iun 4744  df-br 4876  df-opab 4938  df-mpt 4955  df-id 5252  df-xp 5352  df-rel 5353  df-cnv 5354  df-co 5355  df-dm 5356  df-rn 5357  df-res 5358  df-ima 5359  df-iota 6090  df-fun 6129  df-fn 6130  df-f 6131  df-fv 6135  df-ov 6913  df-oprab 6914  df-mpt2 6915  df-1st 7433  df-2nd 7434  df-map 8129  df-topgen 16464  df-top 21076  df-topon 21093  df-bases 21128  df-cn 21409  df-tx 21743 This theorem is referenced by:  cnmpt22  21855  txhmeo  21984  txswaphmeo  21986  txsconnlem  31764
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