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Theorem dvcn 14203

Description: A differentiable function is continuous. (Contributed by Mario Carneiro, 7-Sep-2014.) (Revised by Mario Carneiro, 7-Sep-2015.)

**Assertion**
Ref	Expression
dvcn	⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → 𝐹 ∈ (𝐴–cn→ℂ))

Proof of Theorem dvcn Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpl2 1001	. . 3 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → 𝐹:𝐴⟶ℂ)
2		eqid 2177	. . . . . 6 ⊢ ((MetOpen‘(abs ∘ − )) ↾_t 𝐴) = ((MetOpen‘(abs ∘ − )) ↾_t 𝐴)
3		eqid 2177	. . . . . 6 ⊢ (MetOpen‘(abs ∘ − )) = (MetOpen‘(abs ∘ − ))
4	2, 3	dvcnp2cntop 14202	. . . . 5 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ 𝑥 ∈ dom (𝑆 D 𝐹)) → 𝐹 ∈ ((((MetOpen‘(abs ∘ − )) ↾_t 𝐴) CnP (MetOpen‘(abs ∘ − )))‘𝑥))
5	4	ralrimiva 2550	. . . 4 ⊢ ((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) → ∀𝑥 ∈ dom (𝑆 D 𝐹)𝐹 ∈ ((((MetOpen‘(abs ∘ − )) ↾_t 𝐴) CnP (MetOpen‘(abs ∘ − )))‘𝑥))
6		raleq 2673	. . . . 5 ⊢ (dom (𝑆 D 𝐹) = 𝐴 → (∀𝑥 ∈ dom (𝑆 D 𝐹)𝐹 ∈ ((((MetOpen‘(abs ∘ − )) ↾_t 𝐴) CnP (MetOpen‘(abs ∘ − )))‘𝑥) ↔ ∀𝑥 ∈ 𝐴 𝐹 ∈ ((((MetOpen‘(abs ∘ − )) ↾_t 𝐴) CnP (MetOpen‘(abs ∘ − )))‘𝑥)))
7	6	biimpd 144	. . . 4 ⊢ (dom (𝑆 D 𝐹) = 𝐴 → (∀𝑥 ∈ dom (𝑆 D 𝐹)𝐹 ∈ ((((MetOpen‘(abs ∘ − )) ↾_t 𝐴) CnP (MetOpen‘(abs ∘ − )))‘𝑥) → ∀𝑥 ∈ 𝐴 𝐹 ∈ ((((MetOpen‘(abs ∘ − )) ↾_t 𝐴) CnP (MetOpen‘(abs ∘ − )))‘𝑥)))
8	5, 7	mpan9 281	. . 3 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → ∀𝑥 ∈ 𝐴 𝐹 ∈ ((((MetOpen‘(abs ∘ − )) ↾_t 𝐴) CnP (MetOpen‘(abs ∘ − )))‘𝑥))
9	3	cntoptopon 14071	. . . . 5 ⊢ (MetOpen‘(abs ∘ − )) ∈ (TopOn‘ℂ)
10		simpl3 1002	. . . . . 6 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → 𝐴 ⊆ 𝑆)
11		simpl1 1000	. . . . . 6 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → 𝑆 ⊆ ℂ)
12	10, 11	sstrd 3167	. . . . 5 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → 𝐴 ⊆ ℂ)
13		resttopon 13710	. . . . 5 ⊢ (((MetOpen‘(abs ∘ − )) ∈ (TopOn‘ℂ) ∧ 𝐴 ⊆ ℂ) → ((MetOpen‘(abs ∘ − )) ↾_t 𝐴) ∈ (TopOn‘𝐴))
14	9, 12, 13	sylancr 414	. . . 4 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → ((MetOpen‘(abs ∘ − )) ↾_t 𝐴) ∈ (TopOn‘𝐴))
15		cncnp 13769	. . . 4 ⊢ ((((MetOpen‘(abs ∘ − )) ↾_t 𝐴) ∈ (TopOn‘𝐴) ∧ (MetOpen‘(abs ∘ − )) ∈ (TopOn‘ℂ)) → (𝐹 ∈ (((MetOpen‘(abs ∘ − )) ↾_t 𝐴) Cn (MetOpen‘(abs ∘ − ))) ↔ (𝐹:𝐴⟶ℂ ∧ ∀𝑥 ∈ 𝐴 𝐹 ∈ ((((MetOpen‘(abs ∘ − )) ↾_t 𝐴) CnP (MetOpen‘(abs ∘ − )))‘𝑥))))
16	14, 9, 15	sylancl 413	. . 3 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → (𝐹 ∈ (((MetOpen‘(abs ∘ − )) ↾_t 𝐴) Cn (MetOpen‘(abs ∘ − ))) ↔ (𝐹:𝐴⟶ℂ ∧ ∀𝑥 ∈ 𝐴 𝐹 ∈ ((((MetOpen‘(abs ∘ − )) ↾_t 𝐴) CnP (MetOpen‘(abs ∘ − )))‘𝑥))))
17	1, 8, 16	mpbir2and 944	. 2 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → 𝐹 ∈ (((MetOpen‘(abs ∘ − )) ↾_t 𝐴) Cn (MetOpen‘(abs ∘ − ))))
18		ssid 3177	. . 3 ⊢ ℂ ⊆ ℂ
19	9	toponrestid 13560	. . . 4 ⊢ (MetOpen‘(abs ∘ − )) = ((MetOpen‘(abs ∘ − )) ↾_t ℂ)
20	3, 2, 19	cncfcncntop 14119	. . 3 ⊢ ((𝐴 ⊆ ℂ ∧ ℂ ⊆ ℂ) → (𝐴–cn→ℂ) = (((MetOpen‘(abs ∘ − )) ↾_t 𝐴) Cn (MetOpen‘(abs ∘ − ))))
21	12, 18, 20	sylancl 413	. 2 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → (𝐴–cn→ℂ) = (((MetOpen‘(abs ∘ − )) ↾_t 𝐴) Cn (MetOpen‘(abs ∘ − ))))
22	17, 21	eleqtrrd 2257	1 ⊢ (((𝑆 ⊆ ℂ ∧ 𝐹:𝐴⟶ℂ ∧ 𝐴 ⊆ 𝑆) ∧ dom (𝑆 D 𝐹) = 𝐴) → 𝐹 ∈ (𝐴–cn→ℂ))

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∧ w3a 978 = wceq 1353 ∈ wcel 2148 ∀wral 2455 ⊆ wss 3131 dom cdm 4628 ∘ ccom 4632 ⟶wf 5214 ‘cfv 5218 (class class class)co 5877 ℂcc 7811 − cmin 8130 abscabs 11008 ↾_t crest 12693 MetOpencmopn 13484 TopOnctopon 13549 Cn ccn 13724 CnP ccnp 13725 –cn→ccncf 14096 D cdv 14163

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-coll 4120 ax-sep 4123 ax-nul 4131 ax-pow 4176 ax-pr 4211 ax-un 4435 ax-setind 4538 ax-iinf 4589 ax-cnex 7904 ax-resscn 7905 ax-1cn 7906 ax-1re 7907 ax-icn 7908 ax-addcl 7909 ax-addrcl 7910 ax-mulcl 7911 ax-mulrcl 7912 ax-addcom 7913 ax-mulcom 7914 ax-addass 7915 ax-mulass 7916 ax-distr 7917 ax-i2m1 7918 ax-0lt1 7919 ax-1rid 7920 ax-0id 7921 ax-rnegex 7922 ax-precex 7923 ax-cnre 7924 ax-pre-ltirr 7925 ax-pre-ltwlin 7926 ax-pre-lttrn 7927 ax-pre-apti 7928 ax-pre-ltadd 7929 ax-pre-mulgt0 7930 ax-pre-mulext 7931 ax-arch 7932 ax-caucvg 7933 ax-addf 7935 ax-mulf 7936

This theorem depends on definitions: df-bi 117 df-stab 831 df-dc 835 df-3or 979 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-reu 2462 df-rmo 2463 df-rab 2464 df-v 2741 df-sbc 2965 df-csb 3060 df-dif 3133 df-un 3135 df-in 3137 df-ss 3144 df-nul 3425 df-if 3537 df-pw 3579 df-sn 3600 df-pr 3601 df-op 3603 df-uni 3812 df-int 3847 df-iun 3890 df-br 4006 df-opab 4067 df-mpt 4068 df-tr 4104 df-id 4295 df-po 4298 df-iso 4299 df-iord 4368 df-on 4370 df-ilim 4371 df-suc 4373 df-iom 4592 df-xp 4634 df-rel 4635 df-cnv 4636 df-co 4637 df-dm 4638 df-rn 4639 df-res 4640 df-ima 4641 df-iota 5180 df-fun 5220 df-fn 5221 df-f 5222 df-f1 5223 df-fo 5224 df-f1o 5225 df-fv 5226 df-isom 5227 df-riota 5833 df-ov 5880 df-oprab 5881 df-mpo 5882 df-1st 6143 df-2nd 6144 df-recs 6308 df-frec 6394 df-map 6652 df-pm 6653 df-sup 6985 df-inf 6986 df-pnf 7996 df-mnf 7997 df-xr 7998 df-ltxr 7999 df-le 8000 df-sub 8132 df-neg 8133 df-reap 8534 df-ap 8541 df-div 8632 df-inn 8922 df-2 8980 df-3 8981 df-4 8982 df-n0 9179 df-z 9256 df-uz 9531 df-q 9622 df-rp 9656 df-xneg 9774 df-xadd 9775 df-seqfrec 10448 df-exp 10522 df-cj 10853 df-re 10854 df-im 10855 df-rsqrt 11009 df-abs 11010 df-rest 12695 df-topgen 12714 df-psmet 13486 df-xmet 13487 df-met 13488 df-bl 13489 df-mopn 13490 df-top 13537 df-topon 13550 df-bases 13582 df-ntr 13635 df-cn 13727 df-cnp 13728 df-tx 13792 df-cncf 14097 df-limced 14164 df-dvap 14165

This theorem is referenced by: efcn 14228

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