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Theorem tgcn 20996
 Description: The continuity predicate when the range is given by a basis for a topology. (Contributed by Mario Carneiro, 7-Feb-2015.) (Revised by Mario Carneiro, 22-Aug-2015.)
Hypotheses
Ref Expression
tgcn.1 (𝜑𝐽 ∈ (TopOn‘𝑋))
tgcn.3 (𝜑𝐾 = (topGen‘𝐵))
tgcn.4 (𝜑𝐾 ∈ (TopOn‘𝑌))
Assertion
Ref Expression
tgcn (𝜑 → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹:𝑋𝑌 ∧ ∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽)))
Distinct variable groups:   𝑦,𝐵   𝑦,𝐹   𝑦,𝐽   𝑦,𝐾   𝑦,𝑋   𝑦,𝑌
Allowed substitution hint:   𝜑(𝑦)

Proof of Theorem tgcn
Dummy variables 𝑥 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 tgcn.1 . . 3 (𝜑𝐽 ∈ (TopOn‘𝑋))
2 tgcn.4 . . 3 (𝜑𝐾 ∈ (TopOn‘𝑌))
3 iscn 20979 . . 3 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐾 ∈ (TopOn‘𝑌)) → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹:𝑋𝑌 ∧ ∀𝑦𝐾 (𝐹𝑦) ∈ 𝐽)))
41, 2, 3syl2anc 692 . 2 (𝜑 → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹:𝑋𝑌 ∧ ∀𝑦𝐾 (𝐹𝑦) ∈ 𝐽)))
5 tgcn.3 . . . . . . . . 9 (𝜑𝐾 = (topGen‘𝐵))
6 topontop 20658 . . . . . . . . . 10 (𝐾 ∈ (TopOn‘𝑌) → 𝐾 ∈ Top)
72, 6syl 17 . . . . . . . . 9 (𝜑𝐾 ∈ Top)
85, 7eqeltrrd 2699 . . . . . . . 8 (𝜑 → (topGen‘𝐵) ∈ Top)
9 tgclb 20714 . . . . . . . 8 (𝐵 ∈ TopBases ↔ (topGen‘𝐵) ∈ Top)
108, 9sylibr 224 . . . . . . 7 (𝜑𝐵 ∈ TopBases)
11 bastg 20710 . . . . . . 7 (𝐵 ∈ TopBases → 𝐵 ⊆ (topGen‘𝐵))
1210, 11syl 17 . . . . . 6 (𝜑𝐵 ⊆ (topGen‘𝐵))
1312, 5sseqtr4d 3627 . . . . 5 (𝜑𝐵𝐾)
14 ssralv 3651 . . . . 5 (𝐵𝐾 → (∀𝑦𝐾 (𝐹𝑦) ∈ 𝐽 → ∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽))
1513, 14syl 17 . . . 4 (𝜑 → (∀𝑦𝐾 (𝐹𝑦) ∈ 𝐽 → ∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽))
165eleq2d 2684 . . . . . . . . 9 (𝜑 → (𝑥𝐾𝑥 ∈ (topGen‘𝐵)))
17 eltg3 20706 . . . . . . . . . 10 (𝐵 ∈ TopBases → (𝑥 ∈ (topGen‘𝐵) ↔ ∃𝑧(𝑧𝐵𝑥 = 𝑧)))
1810, 17syl 17 . . . . . . . . 9 (𝜑 → (𝑥 ∈ (topGen‘𝐵) ↔ ∃𝑧(𝑧𝐵𝑥 = 𝑧)))
1916, 18bitrd 268 . . . . . . . 8 (𝜑 → (𝑥𝐾 ↔ ∃𝑧(𝑧𝐵𝑥 = 𝑧)))
20 ssralv 3651 . . . . . . . . . . . 12 (𝑧𝐵 → (∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 → ∀𝑦𝑧 (𝐹𝑦) ∈ 𝐽))
21 topontop 20658 . . . . . . . . . . . . . 14 (𝐽 ∈ (TopOn‘𝑋) → 𝐽 ∈ Top)
221, 21syl 17 . . . . . . . . . . . . 13 (𝜑𝐽 ∈ Top)
23 iunopn 20643 . . . . . . . . . . . . . 14 ((𝐽 ∈ Top ∧ ∀𝑦𝑧 (𝐹𝑦) ∈ 𝐽) → 𝑦𝑧 (𝐹𝑦) ∈ 𝐽)
2423ex 450 . . . . . . . . . . . . 13 (𝐽 ∈ Top → (∀𝑦𝑧 (𝐹𝑦) ∈ 𝐽 𝑦𝑧 (𝐹𝑦) ∈ 𝐽))
2522, 24syl 17 . . . . . . . . . . . 12 (𝜑 → (∀𝑦𝑧 (𝐹𝑦) ∈ 𝐽 𝑦𝑧 (𝐹𝑦) ∈ 𝐽))
2620, 25sylan9r 689 . . . . . . . . . . 11 ((𝜑𝑧𝐵) → (∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 𝑦𝑧 (𝐹𝑦) ∈ 𝐽))
27 imaeq2 5431 . . . . . . . . . . . . . 14 (𝑥 = 𝑧 → (𝐹𝑥) = (𝐹 𝑧))
28 imauni 6469 . . . . . . . . . . . . . 14 (𝐹 𝑧) = 𝑦𝑧 (𝐹𝑦)
2927, 28syl6eq 2671 . . . . . . . . . . . . 13 (𝑥 = 𝑧 → (𝐹𝑥) = 𝑦𝑧 (𝐹𝑦))
3029eleq1d 2683 . . . . . . . . . . . 12 (𝑥 = 𝑧 → ((𝐹𝑥) ∈ 𝐽 𝑦𝑧 (𝐹𝑦) ∈ 𝐽))
3130imbi2d 330 . . . . . . . . . . 11 (𝑥 = 𝑧 → ((∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 → (𝐹𝑥) ∈ 𝐽) ↔ (∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 𝑦𝑧 (𝐹𝑦) ∈ 𝐽)))
3226, 31syl5ibrcom 237 . . . . . . . . . 10 ((𝜑𝑧𝐵) → (𝑥 = 𝑧 → (∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 → (𝐹𝑥) ∈ 𝐽)))
3332expimpd 628 . . . . . . . . 9 (𝜑 → ((𝑧𝐵𝑥 = 𝑧) → (∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 → (𝐹𝑥) ∈ 𝐽)))
3433exlimdv 1858 . . . . . . . 8 (𝜑 → (∃𝑧(𝑧𝐵𝑥 = 𝑧) → (∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 → (𝐹𝑥) ∈ 𝐽)))
3519, 34sylbid 230 . . . . . . 7 (𝜑 → (𝑥𝐾 → (∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 → (𝐹𝑥) ∈ 𝐽)))
3635imp 445 . . . . . 6 ((𝜑𝑥𝐾) → (∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 → (𝐹𝑥) ∈ 𝐽))
3736ralrimdva 2965 . . . . 5 (𝜑 → (∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 → ∀𝑥𝐾 (𝐹𝑥) ∈ 𝐽))
38 imaeq2 5431 . . . . . . 7 (𝑥 = 𝑦 → (𝐹𝑥) = (𝐹𝑦))
3938eleq1d 2683 . . . . . 6 (𝑥 = 𝑦 → ((𝐹𝑥) ∈ 𝐽 ↔ (𝐹𝑦) ∈ 𝐽))
4039cbvralv 3163 . . . . 5 (∀𝑥𝐾 (𝐹𝑥) ∈ 𝐽 ↔ ∀𝑦𝐾 (𝐹𝑦) ∈ 𝐽)
4137, 40syl6ib 241 . . . 4 (𝜑 → (∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽 → ∀𝑦𝐾 (𝐹𝑦) ∈ 𝐽))
4215, 41impbid 202 . . 3 (𝜑 → (∀𝑦𝐾 (𝐹𝑦) ∈ 𝐽 ↔ ∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽))
4342anbi2d 739 . 2 (𝜑 → ((𝐹:𝑋𝑌 ∧ ∀𝑦𝐾 (𝐹𝑦) ∈ 𝐽) ↔ (𝐹:𝑋𝑌 ∧ ∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽)))
444, 43bitrd 268 1 (𝜑 → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹:𝑋𝑌 ∧ ∀𝑦𝐵 (𝐹𝑦) ∈ 𝐽)))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384   = wceq 1480  ∃wex 1701   ∈ wcel 1987  ∀wral 2908   ⊆ wss 3560  ∪ cuni 4409  ∪ ciun 4492  ◡ccnv 5083   “ cima 5087  ⟶wf 5853  ‘cfv 5857  (class class class)co 6615  topGenctg 16038  Topctop 20638  TopOnctopon 20655  TopBasesctb 20689   Cn ccn 20968 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4751  ax-nul 4759  ax-pow 4813  ax-pr 4877  ax-un 6914 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2913  df-rex 2914  df-rab 2917  df-v 3192  df-sbc 3423  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-nul 3898  df-if 4065  df-pw 4138  df-sn 4156  df-pr 4158  df-op 4162  df-uni 4410  df-iun 4494  df-br 4624  df-opab 4684  df-mpt 4685  df-id 4999  df-xp 5090  df-rel 5091  df-cnv 5092  df-co 5093  df-dm 5094  df-rn 5095  df-res 5096  df-ima 5097  df-iota 5820  df-fun 5859  df-fn 5860  df-f 5861  df-fv 5865  df-ov 6618  df-oprab 6619  df-mpt2 6620  df-map 7819  df-topgen 16044  df-top 20639  df-topon 20656  df-bases 20690  df-cn 20971 This theorem is referenced by:  subbascn  20998  txcnmpt  21367  ismtyhmeolem  33274
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