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Theorem cnmpt21f 15283
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))
cnmpt21f.f (𝜑𝐹 ∈ (𝐿 Cn 𝑀))
Assertion
Ref Expression
cnmpt21f (𝜑 → (𝑥𝑋, 𝑦𝑌 ↦ (𝐹𝐴)) ∈ ((𝐽 ×t 𝐾) Cn 𝑀))
Distinct variable groups:   𝑥,𝑦,𝐹   𝑥,𝐿,𝑦   𝜑,𝑥,𝑦   𝑥,𝑋,𝑦   𝑥,𝑀,𝑦   𝑥,𝑌,𝑦
Allowed substitution hints:   𝐴(𝑥,𝑦)   𝐽(𝑥,𝑦)   𝐾(𝑥,𝑦)

Proof of Theorem cnmpt21f
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 cnmpt21.j . 2 (𝜑𝐽 ∈ (TopOn‘𝑋))
2 cnmpt21.k . 2 (𝜑𝐾 ∈ (TopOn‘𝑌))
3 cnmpt21.a . 2 (𝜑 → (𝑥𝑋, 𝑦𝑌𝐴) ∈ ((𝐽 ×t 𝐾) Cn 𝐿))
4 cnmpt21f.f . . . 4 (𝜑𝐹 ∈ (𝐿 Cn 𝑀))
5 cntop1 15192 . . . 4 (𝐹 ∈ (𝐿 Cn 𝑀) → 𝐿 ∈ Top)
64, 5syl 14 . . 3 (𝜑𝐿 ∈ Top)
7 toptopon2 15010 . . 3 (𝐿 ∈ Top ↔ 𝐿 ∈ (TopOn‘ 𝐿))
86, 7sylib 122 . 2 (𝜑𝐿 ∈ (TopOn‘ 𝐿))
9 eqid 2234 . . . . . 6 𝐿 = 𝐿
10 eqid 2234 . . . . . 6 𝑀 = 𝑀
119, 10cnf 15195 . . . . 5 (𝐹 ∈ (𝐿 Cn 𝑀) → 𝐹: 𝐿 𝑀)
124, 11syl 14 . . . 4 (𝜑𝐹: 𝐿 𝑀)
1312feqmptd 5735 . . 3 (𝜑𝐹 = (𝑧 𝐿 ↦ (𝐹𝑧)))
1413, 4eqeltrrd 2312 . 2 (𝜑 → (𝑧 𝐿 ↦ (𝐹𝑧)) ∈ (𝐿 Cn 𝑀))
15 fveq2 5675 . 2 (𝑧 = 𝐴 → (𝐹𝑧) = (𝐹𝐴))
161, 2, 3, 8, 14, 15cnmpt21 15282 1 (𝜑 → (𝑥𝑋, 𝑦𝑌 ↦ (𝐹𝐴)) ∈ ((𝐽 ×t 𝐾) Cn 𝑀))
Colors of variables: wff set class
Syntax hints:  wi 4  wcel 2205   cuni 3919  cmpt 4176  wf 5353  cfv 5357  (class class class)co 6058  cmpo 6060  Topctop 14988  TopOnctopon 15001   Cn ccn 15176   ×t ctx 15243
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4230  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-reu 2529  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-iun 3998  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-ov 6061  df-oprab 6062  df-mpo 6063  df-1st 6347  df-2nd 6348  df-map 6897  df-topgen 13557  df-top 14989  df-topon 15002  df-bases 15034  df-cn 15179  df-tx 15244
This theorem is referenced by:  cnmpt22  15285  txhmeo  15310
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