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Theorem limcvallem 25844

Description: Lemma for ellimc 25846. (Contributed by Mario Carneiro, 25-Dec-2016.)

**Hypotheses**
Ref	Expression
limcval.j	⊢ 𝐽 = (𝐾 ↾_t (𝐴 ∪ {𝐵}))
limcval.k	⊢ 𝐾 = (TopOpen‘ℂ_fld)
limcvallem.g	⊢ 𝐺 = (𝑧 ∈ (𝐴 ∪ {𝐵}) ↦ if(𝑧 = 𝐵, 𝐶, (𝐹‘𝑧)))

**Assertion**
Ref	Expression
limcvallem	⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) → (𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵) → 𝐶 ∈ ℂ))

Distinct variable groups: 𝑧,𝐴 𝑧,𝐵 𝑧,𝐹 𝑧,𝐾 𝑧,𝐶 Allowed substitution hints: 𝐺(𝑧) 𝐽(𝑧)

**Proof of Theorem limcvallem**
Step	Hyp	Ref	Expression
1		iftrue 4536	. . . 4 ⊢ (𝑧 = 𝐵 → if(𝑧 = 𝐵, 𝐶, (𝐹‘𝑧)) = 𝐶)
2	1	eleq1d 2810	. . 3 ⊢ (𝑧 = 𝐵 → (if(𝑧 = 𝐵, 𝐶, (𝐹‘𝑧)) ∈ ℂ ↔ 𝐶 ∈ ℂ))
3		limcval.j	. . . . . 6 ⊢ 𝐽 = (𝐾 ↾_t (𝐴 ∪ {𝐵}))
4		limcval.k	. . . . . . . 8 ⊢ 𝐾 = (TopOpen‘ℂ_fld)
5	4	cnfldtopon 24743	. . . . . . 7 ⊢ 𝐾 ∈ (TopOn‘ℂ)
6		simpl2 1189	. . . . . . . 8 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → 𝐴 ⊆ ℂ)
7		simpl3 1190	. . . . . . . . 9 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → 𝐵 ∈ ℂ)
8	7	snssd 4814	. . . . . . . 8 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → {𝐵} ⊆ ℂ)
9	6, 8	unssd 4184	. . . . . . 7 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → (𝐴 ∪ {𝐵}) ⊆ ℂ)
10		resttopon 23109	. . . . . . 7 ⊢ ((𝐾 ∈ (TopOn‘ℂ) ∧ (𝐴 ∪ {𝐵}) ⊆ ℂ) → (𝐾 ↾_t (𝐴 ∪ {𝐵})) ∈ (TopOn‘(𝐴 ∪ {𝐵})))
11	5, 9, 10	sylancr 585	. . . . . 6 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → (𝐾 ↾_t (𝐴 ∪ {𝐵})) ∈ (TopOn‘(𝐴 ∪ {𝐵})))
12	3, 11	eqeltrid 2829	. . . . 5 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → 𝐽 ∈ (TopOn‘(𝐴 ∪ {𝐵})))
13	5	a1i 11	. . . . 5 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → 𝐾 ∈ (TopOn‘ℂ))
14		simpr 483	. . . . 5 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵))
15		cnpf2 23198	. . . . 5 ⊢ ((𝐽 ∈ (TopOn‘(𝐴 ∪ {𝐵})) ∧ 𝐾 ∈ (TopOn‘ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → 𝐺:(𝐴 ∪ {𝐵})⟶ℂ)
16	12, 13, 14, 15	syl3anc 1368	. . . 4 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → 𝐺:(𝐴 ∪ {𝐵})⟶ℂ)
17		limcvallem.g	. . . . 5 ⊢ 𝐺 = (𝑧 ∈ (𝐴 ∪ {𝐵}) ↦ if(𝑧 = 𝐵, 𝐶, (𝐹‘𝑧)))
18	17	fmpt 7119	. . . 4 ⊢ (∀𝑧 ∈ (𝐴 ∪ {𝐵})if(𝑧 = 𝐵, 𝐶, (𝐹‘𝑧)) ∈ ℂ ↔ 𝐺:(𝐴 ∪ {𝐵})⟶ℂ)
19	16, 18	sylibr 233	. . 3 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → ∀𝑧 ∈ (𝐴 ∪ {𝐵})if(𝑧 = 𝐵, 𝐶, (𝐹‘𝑧)) ∈ ℂ)
20		ssun2 4171	. . . 4 ⊢ {𝐵} ⊆ (𝐴 ∪ {𝐵})
21		snssg 4789	. . . . 5 ⊢ (𝐵 ∈ ℂ → (𝐵 ∈ (𝐴 ∪ {𝐵}) ↔ {𝐵} ⊆ (𝐴 ∪ {𝐵})))
22	7, 21	syl 17	. . . 4 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → (𝐵 ∈ (𝐴 ∪ {𝐵}) ↔ {𝐵} ⊆ (𝐴 ∪ {𝐵})))
23	20, 22	mpbiri 257	. . 3 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → 𝐵 ∈ (𝐴 ∪ {𝐵}))
24	2, 19, 23	rspcdva 3607	. 2 ⊢ (((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) ∧ 𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵)) → 𝐶 ∈ ℂ)
25	24	ex 411	1 ⊢ ((𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ ℂ ∧ 𝐵 ∈ ℂ) → (𝐺 ∈ ((𝐽 CnP 𝐾)‘𝐵) → 𝐶 ∈ ℂ))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ∀wral 3050 ∪ cun 3942 ⊆ wss 3944 ifcif 4530 {csn 4630 ↦ cmpt 5232 ⟶wf 6545 ‘cfv 6549 (class class class)co 7419 ℂcc 11138 ↾_t crest 17405 TopOpenctopn 17406 ℂ_fldccnfld 21296 TopOnctopon 22856 CnP ccnp 23173

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5365 ax-pr 5429 ax-un 7741 ax-cnex 11196 ax-resscn 11197 ax-1cn 11198 ax-icn 11199 ax-addcl 11200 ax-addrcl 11201 ax-mulcl 11202 ax-mulrcl 11203 ax-mulcom 11204 ax-addass 11205 ax-mulass 11206 ax-distr 11207 ax-i2m1 11208 ax-1ne0 11209 ax-1rid 11210 ax-rnegex 11211 ax-rrecex 11212 ax-cnre 11213 ax-pre-lttri 11214 ax-pre-lttrn 11215 ax-pre-ltadd 11216 ax-pre-mulgt0 11217 ax-pre-sup 11218

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2930 df-nel 3036 df-ral 3051 df-rex 3060 df-rmo 3363 df-reu 3364 df-rab 3419 df-v 3463 df-sbc 3774 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3964 df-nul 4323 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-tp 4635 df-op 4637 df-uni 4910 df-int 4951 df-iun 4999 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6307 df-ord 6374 df-on 6375 df-lim 6376 df-suc 6377 df-iota 6501 df-fun 6551 df-fn 6552 df-f 6553 df-f1 6554 df-fo 6555 df-f1o 6556 df-fv 6557 df-riota 7375 df-ov 7422 df-oprab 7423 df-mpo 7424 df-om 7872 df-1st 7994 df-2nd 7995 df-frecs 8287 df-wrecs 8318 df-recs 8392 df-rdg 8431 df-1o 8487 df-er 8725 df-map 8847 df-en 8965 df-dom 8966 df-sdom 8967 df-fin 8968 df-fi 9436 df-sup 9467 df-inf 9468 df-pnf 11282 df-mnf 11283 df-xr 11284 df-ltxr 11285 df-le 11286 df-sub 11478 df-neg 11479 df-div 11904 df-nn 12246 df-2 12308 df-3 12309 df-4 12310 df-5 12311 df-6 12312 df-7 12313 df-8 12314 df-9 12315 df-n0 12506 df-z 12592 df-dec 12711 df-uz 12856 df-q 12966 df-rp 13010 df-xneg 13127 df-xadd 13128 df-xmul 13129 df-fz 13520 df-seq 14003 df-exp 14063 df-cj 15082 df-re 15083 df-im 15084 df-sqrt 15218 df-abs 15219 df-struct 17119 df-slot 17154 df-ndx 17166 df-base 17184 df-plusg 17249 df-mulr 17250 df-starv 17251 df-tset 17255 df-ple 17256 df-ds 17258 df-unif 17259 df-rest 17407 df-topn 17408 df-topgen 17428 df-psmet 21288 df-xmet 21289 df-met 21290 df-bl 21291 df-mopn 21292 df-cnfld 21297 df-top 22840 df-topon 22857 df-topsp 22879 df-bases 22893 df-cnp 23176 df-xms 24270 df-ms 24271

This theorem is referenced by: limcfval 25845 ellimc 25846

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