Theorem subbascn 21058

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 21056	. 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 481	. . . . 5 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → 𝐵 ∈ 𝑉)
7		ssfii 8325	. . . . 5 ⊢ (𝐵 ∈ 𝑉 → 𝐵 ⊆ (fi‘𝐵))
8		ssralv 3666	. . . . 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 3203	. . . . . . . . 9 ⊢ 𝑥 ∈ V
11		elfi 8319	. . . . . . . . 9 ⊢ ((𝑥 ∈ V ∧ 𝐵 ∈ 𝑉) → (𝑥 ∈ (fi‘𝐵) ↔ ∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧))
12	10, 6, 11	sylancr 695	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (𝑥 ∈ (fi‘𝐵) ↔ ∃𝑧 ∈ (𝒫 𝐵 ∩ Fin)𝑥 = ∩ 𝑧))
13		simpr2 1068	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑥 = ∩ 𝑧)
14	13	imaeq2d 5466	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) = (◡𝐹 “ ∩ 𝑧))
15		ffun 6048	. . . . . . . . . . . . . 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 2710	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∩ 𝑧 ∈ V)
18		intex 4820	. . . . . . . . . . . . . 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 6346	. . . . . . . . . . . . 13 ⊢ ((Fun 𝐹 ∧ 𝑧 ≠ ∅) → (◡𝐹 “ ∩ 𝑧) = ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦))
21	16, 19, 20	syl2anc 693	. . . . . . . . . . . 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 2656	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) = ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦))
23		topontop 20718	. . . . . . . . . . . . . 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 3834	. . . . . . . . . . . . 13 ⊢ (𝒫 𝐵 ∩ Fin) ⊆ Fin
27		simpr1 1067	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ (𝒫 𝐵 ∩ Fin))
28	26, 27	sseldi 3601	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ Fin)
29		inss1 3833	. . . . . . . . . . . . . . 15 ⊢ (𝒫 𝐵 ∩ Fin) ⊆ 𝒫 𝐵
30	29, 27	sseldi 3601	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ∈ 𝒫 𝐵)
31	30	elpwid 4170	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → 𝑧 ⊆ 𝐵)
32		simpr3 1069	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)
33		ssralv 3666	. . . . . . . . . . . . 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 20707	. . . . . . . . . . . 12 ⊢ ((𝐽 ∈ Top ∧ (𝑧 ∈ Fin ∧ 𝑧 ≠ ∅ ∧ ∀𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)) → ∩ 𝑦 ∈ 𝑧 (◡𝐹 “ 𝑦) ∈ 𝐽)
36	25, 28, 19, 34, 35	syl13anc 1328	. . . . . . . . . . 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 2701	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝐹:𝑋⟶𝑌) ∧ (𝑧 ∈ (𝒫 𝐵 ∩ Fin) ∧ 𝑥 = ∩ 𝑧 ∧ ∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽)) → (◡𝐹 “ 𝑥) ∈ 𝐽)
38	37	3exp2 1285	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (𝑧 ∈ (𝒫 𝐵 ∩ Fin) → (𝑥 = ∩ 𝑧 → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → (◡𝐹 “ 𝑥) ∈ 𝐽))))
39	38	rexlimdv 3030	. . . . . . . 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 2968	. . . . 5 ⊢ ((𝜑 ∧ 𝐹:𝑋⟶𝑌) → (∀𝑦 ∈ 𝐵 (◡𝐹 “ 𝑦) ∈ 𝐽 → ∀𝑥 ∈ (fi‘𝐵)(◡𝐹 “ 𝑥) ∈ 𝐽))
43		imaeq2 5462	. . . . . . 7 ⊢ (𝑦 = 𝑥 → (◡𝐹 “ 𝑦) = (◡𝐹 “ 𝑥))
44	43	eleq1d 2686	. . . . . 6 ⊢ (𝑦 = 𝑥 → ((◡𝐹 “ 𝑦) ∈ 𝐽 ↔ (◡𝐹 “ 𝑥) ∈ 𝐽))
45	44	cbvralv 3171	. . . . 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 673	. 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 384   ∧ w3a 1037   = wceq 1483   ∈ wcel 1990   ≠ wne 2794  ∀wral 2912  ∃wrex 2913  Vcvv 3200   ∩ cin 3573   ⊆ wss 3574  ∅c0 3915  𝒫 cpw 4158  ∩ cint 4475  ∩ ciin 4521  ^◡ccnv 5113   “ cima 5117  Fun wfun 5882  ⟶wf 5884  ‘cfv 5888  (class class class)co 6650  Fincfn 7955  ficfi 8316  topGenctg 16098  Topctop 20698  TopOnctopon 20715   Cn ccn 21028

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-iin 4523  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-map 7859  df-en 7956  df-dom 7957  df-fin 7959  df-fi 8317  df-topgen 16104  df-top 20699  df-topon 20716  df-bases 20750  df-cn 21031

This theorem is referenced by:  xkoccn  21422  ptrescn  21442  xkoco1cn  21460  xkoco2cn  21461  xkococn  21463  xkoinjcn  21490  ordthmeolem  21604