Theorem subbascn 22386

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 22384	. 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 480	. . . . 5 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → 𝐵 ∈ 𝑉)
7		ssfii 9139	. . . . 5 ⊢ (𝐵 ∈ 𝑉 → 𝐵 ⊆ (fi‘𝐵))
8		ssralv 3991	. . . . 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 3434	. . . . . . . . 9 ⊢ 𝑥 ∈ V
11		elfi 9133	. . . . . . . . 9 ⊢ ((𝑥 ∈ V ∧ 𝐵 ∈ 𝑉) → (𝑥 ∈ (fi‘𝐵) ↔ ∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧))
12	10, 6, 11	sylancr 586	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (𝑥 ∈ (fi‘𝐵) ↔ ∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧))
13		simpr2 1193	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑥 = ∩ 𝑧)
14	13	imaeq2d 5966	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) = (◡𝐹 “ ∩ 𝑧))
15		ffun 6599	. . . . . . . . . . . . . 14 ⊢ (𝐹:𝑋⟶𝑌 → Fun 𝐹)
16	15	ad2antlr 723	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → Fun 𝐹)
17	13, 10	eqeltrrdi 2849	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∩ 𝑧 ∈ V)
18		intex 5264	. . . . . . . . . . . . . 14 ⊢ (𝑧 ≠ ∅ ↔ ∩ 𝑧 ∈ V)
19	17, 18	sylibr 233	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ≠ ∅)
20		intpreima 6941	. . . . . . . . . . . . 13 ⊢ ((Fun 𝐹 ∧ 𝑧 ≠ ∅) → (◡𝐹 “ ∩ 𝑧) = ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦))
21	16, 19, 20	syl2anc 583	. . . . . . . . . . . 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 2779	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) = ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦))
23		topontop 22043	. . . . . . . . . . . . . 14 ⊢ (𝐽 ∈ (TopOn‘𝑋) → 𝐽 ∈ Top)
24	1, 23	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐽 ∈ Top)
25	24	ad2antrr 722	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝐽 ∈ Top)
26		simpr1 1192	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ (𝒫 𝐵 ∩ Fin))
27	26	elin2d 4137	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ Fin)
28	26	elin1d 4136	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ 𝒫 𝐵)
29	28	elpwid 4549	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ⊆ 𝐵)
30		simpr3 1194	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)
31		ssralv 3991	. . . . . . . . . . . . 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 22032	. . . . . . . . . . . 12 ⊢ ((𝐽 ∈ Top ∧ (𝑧 ∈ Fin ∧ 𝑧 ≠ ∅ ∧ ∀𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)
34	25, 27, 19, 32, 33	syl13anc 1370	. . . . . . . . . . 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 2840	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) ∈ 𝐽)
36	35	3exp2 1352	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (𝑧 ∈ (𝒫 𝐵 ∩ Fin) → (𝑥 = ∩ 𝑧 → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (◡𝐹 “ 𝑥) ∈ 𝐽))))
37	36	rexlimdv 3213	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧 → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (◡𝐹 “ 𝑥) ∈ 𝐽)))
38	12, 37	sylbid 239	. . . . . . 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 3113	. . . . 5 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑥 ∈ (fi‘𝐵)(◡𝐹 “ 𝑥) ∈ 𝐽))
41		imaeq2 5962	. . . . . . 7 ⊢ (𝑦 = 𝑥 → (◡𝐹 “ 𝑦) = (◡𝐹 “ 𝑥))
42	41	eleq1d 2824	. . . . . 6 ⊢ (𝑦 = 𝑥 → ((◡𝐹 “ 𝑦) ∈ 𝐽 ↔ (◡𝐹 “ 𝑥) ∈ 𝐽))
43	42	cbvralvw 3380	. . . . 5 ⊢ (∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽 ↔ ∀𝑥 ∈ (fi‘𝐵)(◡𝐹 “ 𝑥) ∈ 𝐽)
44	40, 43	syl6ibr 251	. . . 4 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽))
45	9, 44	impbid 211	. . 3 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽 ↔ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽))
46	45	pm5.32da 578	. 2 ⊢ (𝜑 → ((𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽) ↔ (𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)))
47	4, 46	bitrd 278	1 ⊢ (𝜑 → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)))

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 395   ∧ w3a 1085   = wceq 1541   ∈ wcel 2109   ≠ wne 2944  ∀wral 3065  ∃wrex 3066  Vcvv 3430   ∩ cin 3890   ⊆ wss 3891  ∅c0 4261  𝒫 cpw 4538  ∩ cint 4884  ∩ ciin 4930  ^◡ccnv 5587   “ cima 5591  Fun wfun 6424  ⟶wf 6426  ‘cfv 6430  (class class class)co 7268  Fincfn 8707  ficfi 9130  topGenctg 17129  Topctop 22023  TopOnctopon 22040   Cn ccn 22356

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1801  ax-4 1815  ax-5 1916  ax-6 1974  ax-7 2014  ax-8 2111  ax-9 2119  ax-10 2140  ax-11 2157  ax-12 2174  ax-ext 2710  ax-sep 5226  ax-nul 5233  ax-pow 5291  ax-pr 5355  ax-un 7579

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1544  df-fal 1554  df-ex 1786  df-nf 1790  df-sb 2071  df-mo 2541  df-eu 2570  df-clab 2717  df-cleq 2731  df-clel 2817  df-nfc 2890  df-ne 2945  df-ral 3070  df-rex 3071  df-reu 3072  df-rab 3074  df-v 3432  df-sbc 3720  df-dif 3894  df-un 3896  df-in 3898  df-ss 3908  df-pss 3910  df-nul 4262  df-if 4465  df-pw 4540  df-sn 4567  df-pr 4569  df-tp 4571  df-op 4573  df-uni 4845  df-int 4885  df-iun 4931  df-iin 4932  df-br 5079  df-opab 5141  df-mpt 5162  df-tr 5196  df-id 5488  df-eprel 5494  df-po 5502  df-so 5503  df-fr 5543  df-we 5545  df-xp 5594  df-rel 5595  df-cnv 5596  df-co 5597  df-dm 5598  df-rn 5599  df-res 5600  df-ima 5601  df-ord 6266  df-on 6267  df-lim 6268  df-suc 6269  df-iota 6388  df-fun 6432  df-fn 6433  df-f 6434  df-f1 6435  df-fo 6436  df-f1o 6437  df-fv 6438  df-ov 7271  df-oprab 7272  df-mpo 7273  df-om 7701  df-1st 7817  df-2nd 7818  df-1o 8281  df-er 8472  df-map 8591  df-en 8708  df-dom 8709  df-fin 8711  df-fi 9131  df-topgen 17135  df-top 22024  df-topon 22041  df-bases 22077  df-cn 22359

This theorem is referenced by:  xkoccn  22751  ptrescn  22771  xkoco1cn  22789  xkoco2cn  22790  xkococn  22792  xkoinjcn  22819  ordthmeolem  22933