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Theorem cnpco 21351
Description: The composition of a function 𝐹 continuous at 𝑃 with a function continuous at (𝐹𝑃) is continuous at 𝑃. Proposition 2 of [BourbakiTop1] p. I.9. (Contributed by FL, 16-Nov-2006.) (Proof shortened by Mario Carneiro, 27-Dec-2014.)
Assertion
Ref Expression
cnpco ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → (𝐺𝐹) ∈ ((𝐽 CnP 𝐿)‘𝑃))

Proof of Theorem cnpco
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 cnptop1 21326 . . . 4 (𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) → 𝐽 ∈ Top)
21adantr 472 . . 3 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → 𝐽 ∈ Top)
3 cnptop2 21327 . . . 4 (𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃)) → 𝐿 ∈ Top)
43adantl 473 . . 3 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → 𝐿 ∈ Top)
5 eqid 2765 . . . . 5 𝐽 = 𝐽
65cnprcl 21329 . . . 4 (𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) → 𝑃 𝐽)
76adantr 472 . . 3 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → 𝑃 𝐽)
82, 4, 73jca 1158 . 2 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → (𝐽 ∈ Top ∧ 𝐿 ∈ Top ∧ 𝑃 𝐽))
9 eqid 2765 . . . . . 6 𝐾 = 𝐾
10 eqid 2765 . . . . . 6 𝐿 = 𝐿
119, 10cnpf 21331 . . . . 5 (𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃)) → 𝐺: 𝐾 𝐿)
1211adantl 473 . . . 4 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → 𝐺: 𝐾 𝐿)
135, 9cnpf 21331 . . . . 5 (𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) → 𝐹: 𝐽 𝐾)
1413adantr 472 . . . 4 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → 𝐹: 𝐽 𝐾)
15 fco 6240 . . . 4 ((𝐺: 𝐾 𝐿𝐹: 𝐽 𝐾) → (𝐺𝐹): 𝐽 𝐿)
1612, 14, 15syl2anc 579 . . 3 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → (𝐺𝐹): 𝐽 𝐿)
17 simplr 785 . . . . . . 7 (((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) → 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃)))
18 simprl 787 . . . . . . 7 (((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) → 𝑧𝐿)
19 fvco3 6464 . . . . . . . . . 10 ((𝐹: 𝐽 𝐾𝑃 𝐽) → ((𝐺𝐹)‘𝑃) = (𝐺‘(𝐹𝑃)))
2014, 7, 19syl2anc 579 . . . . . . . . 9 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → ((𝐺𝐹)‘𝑃) = (𝐺‘(𝐹𝑃)))
2120adantr 472 . . . . . . . 8 (((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) → ((𝐺𝐹)‘𝑃) = (𝐺‘(𝐹𝑃)))
22 simprr 789 . . . . . . . 8 (((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) → ((𝐺𝐹)‘𝑃) ∈ 𝑧)
2321, 22eqeltrrd 2845 . . . . . . 7 (((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) → (𝐺‘(𝐹𝑃)) ∈ 𝑧)
24 cnpimaex 21340 . . . . . . 7 ((𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃)) ∧ 𝑧𝐿 ∧ (𝐺‘(𝐹𝑃)) ∈ 𝑧) → ∃𝑦𝐾 ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))
2517, 18, 23, 24syl3anc 1490 . . . . . 6 (((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) → ∃𝑦𝐾 ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))
26 simplll 791 . . . . . . . 8 ((((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) ∧ (𝑦𝐾 ∧ ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))) → 𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃))
27 simprl 787 . . . . . . . 8 ((((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) ∧ (𝑦𝐾 ∧ ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))) → 𝑦𝐾)
28 simprrl 799 . . . . . . . 8 ((((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) ∧ (𝑦𝐾 ∧ ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))) → (𝐹𝑃) ∈ 𝑦)
29 cnpimaex 21340 . . . . . . . 8 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝑦𝐾 ∧ (𝐹𝑃) ∈ 𝑦) → ∃𝑥𝐽 (𝑃𝑥 ∧ (𝐹𝑥) ⊆ 𝑦))
3026, 27, 28, 29syl3anc 1490 . . . . . . 7 ((((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) ∧ (𝑦𝐾 ∧ ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))) → ∃𝑥𝐽 (𝑃𝑥 ∧ (𝐹𝑥) ⊆ 𝑦))
31 imaco 5826 . . . . . . . . . . 11 ((𝐺𝐹) “ 𝑥) = (𝐺 “ (𝐹𝑥))
32 imass2 5683 . . . . . . . . . . 11 ((𝐹𝑥) ⊆ 𝑦 → (𝐺 “ (𝐹𝑥)) ⊆ (𝐺𝑦))
3331, 32syl5eqss 3809 . . . . . . . . . 10 ((𝐹𝑥) ⊆ 𝑦 → ((𝐺𝐹) “ 𝑥) ⊆ (𝐺𝑦))
34 simprrr 800 . . . . . . . . . 10 ((((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) ∧ (𝑦𝐾 ∧ ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))) → (𝐺𝑦) ⊆ 𝑧)
35 sstr2 3768 . . . . . . . . . 10 (((𝐺𝐹) “ 𝑥) ⊆ (𝐺𝑦) → ((𝐺𝑦) ⊆ 𝑧 → ((𝐺𝐹) “ 𝑥) ⊆ 𝑧))
3633, 34, 35syl2imc 41 . . . . . . . . 9 ((((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) ∧ (𝑦𝐾 ∧ ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))) → ((𝐹𝑥) ⊆ 𝑦 → ((𝐺𝐹) “ 𝑥) ⊆ 𝑧))
3736anim2d 605 . . . . . . . 8 ((((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) ∧ (𝑦𝐾 ∧ ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))) → ((𝑃𝑥 ∧ (𝐹𝑥) ⊆ 𝑦) → (𝑃𝑥 ∧ ((𝐺𝐹) “ 𝑥) ⊆ 𝑧)))
3837reximdv 3162 . . . . . . 7 ((((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) ∧ (𝑦𝐾 ∧ ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))) → (∃𝑥𝐽 (𝑃𝑥 ∧ (𝐹𝑥) ⊆ 𝑦) → ∃𝑥𝐽 (𝑃𝑥 ∧ ((𝐺𝐹) “ 𝑥) ⊆ 𝑧)))
3930, 38mpd 15 . . . . . 6 ((((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) ∧ (𝑦𝐾 ∧ ((𝐹𝑃) ∈ 𝑦 ∧ (𝐺𝑦) ⊆ 𝑧))) → ∃𝑥𝐽 (𝑃𝑥 ∧ ((𝐺𝐹) “ 𝑥) ⊆ 𝑧))
4025, 39rexlimddv 3182 . . . . 5 (((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ (𝑧𝐿 ∧ ((𝐺𝐹)‘𝑃) ∈ 𝑧)) → ∃𝑥𝐽 (𝑃𝑥 ∧ ((𝐺𝐹) “ 𝑥) ⊆ 𝑧))
4140expr 448 . . . 4 (((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) ∧ 𝑧𝐿) → (((𝐺𝐹)‘𝑃) ∈ 𝑧 → ∃𝑥𝐽 (𝑃𝑥 ∧ ((𝐺𝐹) “ 𝑥) ⊆ 𝑧)))
4241ralrimiva 3113 . . 3 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → ∀𝑧𝐿 (((𝐺𝐹)‘𝑃) ∈ 𝑧 → ∃𝑥𝐽 (𝑃𝑥 ∧ ((𝐺𝐹) “ 𝑥) ⊆ 𝑧)))
4316, 42jca 507 . 2 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → ((𝐺𝐹): 𝐽 𝐿 ∧ ∀𝑧𝐿 (((𝐺𝐹)‘𝑃) ∈ 𝑧 → ∃𝑥𝐽 (𝑃𝑥 ∧ ((𝐺𝐹) “ 𝑥) ⊆ 𝑧))))
445, 10iscnp2 21323 . 2 ((𝐺𝐹) ∈ ((𝐽 CnP 𝐿)‘𝑃) ↔ ((𝐽 ∈ Top ∧ 𝐿 ∈ Top ∧ 𝑃 𝐽) ∧ ((𝐺𝐹): 𝐽 𝐿 ∧ ∀𝑧𝐿 (((𝐺𝐹)‘𝑃) ∈ 𝑧 → ∃𝑥𝐽 (𝑃𝑥 ∧ ((𝐺𝐹) “ 𝑥) ⊆ 𝑧)))))
458, 43, 44sylanbrc 578 1 ((𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ∧ 𝐺 ∈ ((𝐾 CnP 𝐿)‘(𝐹𝑃))) → (𝐺𝐹) ∈ ((𝐽 CnP 𝐿)‘𝑃))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 384  w3a 1107   = wceq 1652  wcel 2155  wral 3055  wrex 3056  wss 3732   cuni 4594  cima 5280  ccom 5281  wf 6064  cfv 6068  (class class class)co 6842  Topctop 20977   CnP ccnp 21309
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1890  ax-4 1904  ax-5 2005  ax-6 2070  ax-7 2105  ax-8 2157  ax-9 2164  ax-10 2183  ax-11 2198  ax-12 2211  ax-13 2352  ax-ext 2743  ax-sep 4941  ax-nul 4949  ax-pow 5001  ax-pr 5062  ax-un 7147
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 874  df-3an 1109  df-tru 1656  df-ex 1875  df-nf 1879  df-sb 2063  df-mo 2565  df-eu 2582  df-clab 2752  df-cleq 2758  df-clel 2761  df-nfc 2896  df-ne 2938  df-ral 3060  df-rex 3061  df-rab 3064  df-v 3352  df-sbc 3597  df-csb 3692  df-dif 3735  df-un 3737  df-in 3739  df-ss 3746  df-nul 4080  df-if 4244  df-pw 4317  df-sn 4335  df-pr 4337  df-op 4341  df-uni 4595  df-iun 4678  df-br 4810  df-opab 4872  df-mpt 4889  df-id 5185  df-xp 5283  df-rel 5284  df-cnv 5285  df-co 5286  df-dm 5287  df-rn 5288  df-res 5289  df-ima 5290  df-iota 6031  df-fun 6070  df-fn 6071  df-f 6072  df-fv 6076  df-ov 6845  df-oprab 6846  df-mpt2 6847  df-1st 7366  df-2nd 7367  df-map 8062  df-top 20978  df-topon 20995  df-cnp 21312
This theorem is referenced by:  limccnp  23946  limccnp2  23947  efrlim  24987
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