Theorem subbascn 21856

Description: The continuity predicate when the range is given by a subbasis for a topology. (Contributed by Mario Carneiro, 7-Feb-2015.) (Revised by Mario Carneiro, 22-Aug-2015.)

Hypotheses

Ref	Expression
subbascn.1	⊢ (𝜑 → 𝐽 ∈ (TopOn‘𝑋))
subbascn.2	⊢ (𝜑 → 𝐵 ∈ 𝑉)
subbascn.3	⊢ (𝜑 → 𝐾 = (topGen‘(fi‘𝐵)))
subbascn.4	⊢ (𝜑 → 𝐾 ∈ (TopOn‘𝑌))

Assertion

Ref	Expression
subbascn	⊢ (𝜑 → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)))

Distinct variable groups:   𝑦,𝐵   𝑦,𝐹   𝑦,𝐽   𝑦,𝑋   𝑦,𝑌   𝑦,𝐾

Allowed substitution hints:   𝜑(𝑦)   𝑉(𝑦)

Proof of Theorem subbascn

Dummy variables 𝑥 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		subbascn.1	. . 3 ⊢ (𝜑 → 𝐽 ∈ (TopOn‘𝑋))
2		subbascn.3	. . 3 ⊢ (𝜑 → 𝐾 = (topGen‘(fi‘𝐵)))
3		subbascn.4	. . 3 ⊢ (𝜑 → 𝐾 ∈ (TopOn‘𝑌))
4	1, 2, 3	tgcn 21854	. 2 ⊢ (𝜑 → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽)))
5		subbascn.2	. . . . . 6 ⊢ (𝜑 → 𝐵 ∈ 𝑉)
6	5	adantr 483	. . . . 5 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → 𝐵 ∈ 𝑉)
7		ssfii 8877	. . . . 5 ⊢ (𝐵 ∈ 𝑉 → 𝐵 ⊆ (fi‘𝐵))
8		ssralv 4032	. . . . 5 ⊢ (𝐵 ⊆ (fi‘𝐵) → (∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽))
9	6, 7, 8	3syl 18	. . . 4 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽))
10		vex 3497	. . . . . . . . 9 ⊢ 𝑥 ∈ V
11		elfi 8871	. . . . . . . . 9 ⊢ ((𝑥 ∈ V ∧ 𝐵 ∈ 𝑉) → (𝑥 ∈ (fi‘𝐵) ↔ ∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧))
12	10, 6, 11	sylancr 589	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (𝑥 ∈ (fi‘𝐵) ↔ ∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧))
13		simpr2 1191	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑥 = ∩ 𝑧)
14	13	imaeq2d 5923	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) = (◡𝐹 “ ∩ 𝑧))
15		ffun 6511	. . . . . . . . . . . . . 14 ⊢ (𝐹:𝑋⟶𝑌 → Fun 𝐹)
16	15	ad2antlr 725	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → Fun 𝐹)
17	13, 10	eqeltrrdi 2922	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∩ 𝑧 ∈ V)
18		intex 5232	. . . . . . . . . . . . . 14 ⊢ (𝑧 ≠ ∅ ↔ ∩ 𝑧 ∈ V)
19	17, 18	sylibr 236	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ≠ ∅)
20		intpreima 6832	. . . . . . . . . . . . 13 ⊢ ((Fun 𝐹 ∧ 𝑧 ≠ ∅) → (◡𝐹 “ ∩ 𝑧) = ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦))
21	16, 19, 20	syl2anc 586	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ ∩ 𝑧) = ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦))
22	14, 21	eqtrd 2856	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) = ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦))
23		topontop 21515	. . . . . . . . . . . . . 14 ⊢ (𝐽 ∈ (TopOn‘𝑋) → 𝐽 ∈ Top)
24	1, 23	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐽 ∈ Top)
25	24	ad2antrr 724	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝐽 ∈ Top)
26		simpr1 1190	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ (𝒫 𝐵 ∩ Fin))
27	26	elin2d 4175	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ Fin)
28	26	elin1d 4174	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ 𝒫 𝐵)
29	28	elpwid 4552	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ⊆ 𝐵)
30		simpr3 1192	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)
31		ssralv 4032	. . . . . . . . . . . . 13 ⊢ (𝑧 ⊆ 𝐵 → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽))
32	29, 30, 31	sylc 65	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∀𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)
33		iinopn 21504	. . . . . . . . . . . 12 ⊢ ((𝐽 ∈ Top ∧ (𝑧 ∈ Fin ∧ 𝑧 ≠ ∅ ∧ ∀𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)
34	25, 27, 19, 32, 33	syl13anc 1368	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)
35	22, 34	eqeltrd 2913	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) ∈ 𝐽)
36	35	3exp2 1350	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (𝑧 ∈ (𝒫 𝐵 ∩ Fin) → (𝑥 = ∩ 𝑧 → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (◡𝐹 “ 𝑥) ∈ 𝐽))))
37	36	rexlimdv 3283	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧 → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (◡𝐹 “ 𝑥) ∈ 𝐽)))
38	12, 37	sylbid 242	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (𝑥 ∈ (fi‘𝐵) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (◡𝐹 “ 𝑥) ∈ 𝐽)))
39	38	com23 86	. . . . . 6 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (𝑥 ∈ (fi‘𝐵) → (◡𝐹 “ 𝑥) ∈ 𝐽)))
40	39	ralrimdv 3188	. . . . 5 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑥 ∈ (fi‘𝐵)(◡𝐹 “ 𝑥) ∈ 𝐽))
41		imaeq2 5919	. . . . . . 7 ⊢ (𝑦 = 𝑥 → (◡𝐹 “ 𝑦) = (◡𝐹 “ 𝑥))
42	41	eleq1d 2897	. . . . . 6 ⊢ (𝑦 = 𝑥 → ((◡𝐹 “ 𝑦) ∈ 𝐽 ↔ (◡𝐹 “ 𝑥) ∈ 𝐽))
43	42	cbvralvw 3449	. . . . 5 ⊢ (∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽 ↔ ∀𝑥 ∈ (fi‘𝐵)(◡𝐹 “ 𝑥) ∈ 𝐽)
44	40, 43	syl6ibr 254	. . . 4 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽))
45	9, 44	impbid 214	. . 3 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽 ↔ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽))
46	45	pm5.32da 581	. 2 ⊢ (𝜑 → ((𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽) ↔ (𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)))
47	4, 46	bitrd 281	1 ⊢ (𝜑 → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)))

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   ∧ w3a 1083   = wceq 1533   ∈ wcel 2110   ≠ wne 3016  ∀wral 3138  ∃wrex 3139  Vcvv 3494   ∩ cin 3934   ⊆ wss 3935  ∅c0 4290  𝒫 cpw 4538  ∩ cint 4868  ∩ ciin 4912  ^◡ccnv 5548   “ cima 5552  Fun wfun 6343  ⟶wf 6345  ‘cfv 6349  (class class class)co 7150  Fincfn 8503  ficfi 8868  topGenctg 16705  Topctop 21495  TopOnctopon 21512   Cn ccn 21826

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-sep 5195  ax-nul 5202  ax-pow 5258  ax-pr 5321  ax-un 7455

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3772  df-csb 3883  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-pss 3953  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4561  df-pr 4563  df-tp 4565  df-op 4567  df-uni 4832  df-int 4869  df-iun 4913  df-iin 4914  df-br 5059  df-opab 5121  df-mpt 5139  df-tr 5165  df-id 5454  df-eprel 5459  df-po 5468  df-so 5469  df-fr 5508  df-we 5510  df-xp 5555  df-rel 5556  df-cnv 5557  df-co 5558  df-dm 5559  df-rn 5560  df-res 5561  df-ima 5562  df-pred 6142  df-ord 6188  df-on 6189  df-lim 6190  df-suc 6191  df-iota 6308  df-fun 6351  df-fn 6352  df-f 6353  df-f1 6354  df-fo 6355  df-f1o 6356  df-fv 6357  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7575  df-1st 7683  df-2nd 7684  df-wrecs 7941  df-recs 8002  df-rdg 8040  df-1o 8096  df-oadd 8100  df-er 8283  df-map 8402  df-en 8504  df-dom 8505  df-fin 8507  df-fi 8869  df-topgen 16711  df-top 21496  df-topon 21513  df-bases 21548  df-cn 21829

This theorem is referenced by:  xkoccn  22221  ptrescn  22241  xkoco1cn  22259  xkoco2cn  22260  xkococn  22262  xkoinjcn  22289  ordthmeolem  22403