Theorem subbascn 21106

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 21104	. 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 8366	. . . . 5 ⊢ (𝐵 ∈ 𝑉 → 𝐵 ⊆ (fi‘𝐵))
8		ssralv 3699	. . . . 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 3234	. . . . . . . . 9 ⊢ 𝑥 ∈ V
11		elfi 8360	. . . . . . . . 9 ⊢ ((𝑥 ∈ V ∧ 𝐵 ∈ 𝑉) → (𝑥 ∈ (fi‘𝐵) ↔ ∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧))
12	10, 6, 11	sylancr 696	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (𝑥 ∈ (fi‘𝐵) ↔ ∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧))
13		simpr2 1088	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑥 = ∩ 𝑧)
14	13	imaeq2d 5501	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) = (◡𝐹 “ ∩ 𝑧))
15		ffun 6086	. . . . . . . . . . . . . 14 ⊢ (𝐹:𝑋⟶𝑌 → Fun 𝐹)
16	15	ad2antlr 763	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → Fun 𝐹)
17	13, 10	syl6eqelr 2739	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∩ 𝑧 ∈ V)
18		intex 4850	. . . . . . . . . . . . . 14 ⊢ (𝑧 ≠ ∅ ↔ ∩ 𝑧 ∈ V)
19	17, 18	sylibr 224	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ≠ ∅)
20		intpreima 6386	. . . . . . . . . . . . 13 ⊢ ((Fun 𝐹 ∧ 𝑧 ≠ ∅) → (◡𝐹 “ ∩ 𝑧) = ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦))
21	16, 19, 20	syl2anc 694	. . . . . . . . . . . 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 2685	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) = ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦))
23		topontop 20766	. . . . . . . . . . . . . 14 ⊢ (𝐽 ∈ (TopOn‘𝑋) → 𝐽 ∈ Top)
24	1, 23	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐽 ∈ Top)
25	24	ad2antrr 762	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝐽 ∈ Top)
26		inss2 3867	. . . . . . . . . . . . 13 ⊢ (𝒫 𝐵 ∩ Fin) ⊆ Fin
27		simpr1 1087	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ (𝒫 𝐵 ∩ Fin))
28	26, 27	sseldi 3634	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ Fin)
29		inss1 3866	. . . . . . . . . . . . . . 15 ⊢ (𝒫 𝐵 ∩ Fin) ⊆ 𝒫 𝐵
30	29, 27	sseldi 3634	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ 𝒫 𝐵)
31	30	elpwid 4203	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ⊆ 𝐵)
32		simpr3 1089	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)
33		ssralv 3699	. . . . . . . . . . . . 13 ⊢ (𝑧 ⊆ 𝐵 → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽))
34	31, 32, 33	sylc 65	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∀𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)
35		iinopn 20755	. . . . . . . . . . . 12 ⊢ ((𝐽 ∈ Top ∧ (𝑧 ∈ Fin ∧ 𝑧 ≠ ∅ ∧ ∀𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)
36	25, 28, 19, 34, 35	syl13anc 1368	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)
37	22, 36	eqeltrd 2730	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) ∈ 𝐽)
38	37	3exp2 1307	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (𝑧 ∈ (𝒫 𝐵 ∩ Fin) → (𝑥 = ∩ 𝑧 → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (◡𝐹 “ 𝑥) ∈ 𝐽))))
39	38	rexlimdv 3059	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧 → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (◡𝐹 “ 𝑥) ∈ 𝐽)))
40	12, 39	sylbid 230	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (𝑥 ∈ (fi‘𝐵) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (◡𝐹 “ 𝑥) ∈ 𝐽)))
41	40	com23 86	. . . . . 6 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (𝑥 ∈ (fi‘𝐵) → (◡𝐹 “ 𝑥) ∈ 𝐽)))
42	41	ralrimdv 2997	. . . . 5 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑥 ∈ (fi‘𝐵)(◡𝐹 “ 𝑥) ∈ 𝐽))
43		imaeq2 5497	. . . . . . 7 ⊢ (𝑦 = 𝑥 → (◡𝐹 “ 𝑦) = (◡𝐹 “ 𝑥))
44	43	eleq1d 2715	. . . . . 6 ⊢ (𝑦 = 𝑥 → ((◡𝐹 “ 𝑦) ∈ 𝐽 ↔ (◡𝐹 “ 𝑥) ∈ 𝐽))
45	44	cbvralv 3201	. . . . 5 ⊢ (∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽 ↔ ∀𝑥 ∈ (fi‘𝐵)(◡𝐹 “ 𝑥) ∈ 𝐽)
46	42, 45	syl6ibr 242	. . . 4 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽))
47	9, 46	impbid 202	. . 3 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽 ↔ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽))
48	47	pm5.32da 674	. 2 ⊢ (𝜑 → ((𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ (fi‘𝐵)(◡𝐹 “ 𝑦) ∈ 𝐽) ↔ (𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)))
49	4, 48	bitrd 268	1 ⊢ (𝜑 → (𝐹 ∈ (𝐽 Cn 𝐾) ↔ (𝐹:𝑋⟶𝑌 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)))

Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 383   ∧ w3a 1054   = wceq 1523   ∈ wcel 2030   ≠ wne 2823  ∀wral 2941  ∃wrex 2942  Vcvv 3231   ∩ cin 3606   ⊆ wss 3607  ∅c0 3948  𝒫 cpw 4191  ∩ cint 4507  ∩ ciin 4553  ^◡ccnv 5142   “ cima 5146  Fun wfun 5920  ⟶wf 5922  ‘cfv 5926  (class class class)co 6690  Fincfn 7997  ficfi 8357  topGenctg 16145  Topctop 20746  TopOnctopon 20763   Cn ccn 21076

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991

This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-int 4508  df-iun 4554  df-iin 4555  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-1st 7210  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-1o 7605  df-oadd 7609  df-er 7787  df-map 7901  df-en 7998  df-dom 7999  df-fin 8001  df-fi 8358  df-topgen 16151  df-top 20747  df-topon 20764  df-bases 20798  df-cn 21079

This theorem is referenced by:  xkoccn  21470  ptrescn  21490  xkoco1cn  21508  xkoco2cn  21509  xkococn  21511  xkoinjcn  21538  ordthmeolem  21652