Theorem expcn 15563

Description: The power function on complex numbers, for fixed exponent 𝑁, is continuous. (Contributed by Mario Carneiro, 5-May-2014.) (Revised by Mario Carneiro, 23-Aug-2014.) Avoid ax-mulf 8266. (Revised by GG, 16-Mar-2025.)

Hypothesis

Ref	Expression
expcn.j	⊢ 𝐽 = (TopOpen‘ℂfld)

Assertion

Ref	Expression
expcn	⊢ (𝑁 ∈ ℕ0 → (𝑥 ∈ ℂ ↦ (𝑥↑𝑁)) ∈ (𝐽 Cn 𝐽))

Distinct variable groups:   𝑥,𝐽   𝑥,𝑁

Proof of Theorem expcn

Dummy variables 𝑘 𝑛 𝑢 𝑣 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		oveq2 6066	. . . 4 ⊢ (𝑛 = 0 → (𝑥↑𝑛) = (𝑥↑0))
2	1	mpteq2dv 4206	. . 3 ⊢ (𝑛 = 0 → (𝑥 ∈ ℂ ↦ (𝑥↑𝑛)) = (𝑥 ∈ ℂ ↦ (𝑥↑0)))
3	2	eleq1d 2303	. 2 ⊢ (𝑛 = 0 → ((𝑥 ∈ ℂ ↦ (𝑥↑𝑛)) ∈ (𝐽 Cn 𝐽) ↔ (𝑥 ∈ ℂ ↦ (𝑥↑0)) ∈ (𝐽 Cn 𝐽)))
4		oveq2 6066	. . . 4 ⊢ (𝑛 = 𝑘 → (𝑥↑𝑛) = (𝑥↑𝑘))
5	4	mpteq2dv 4206	. . 3 ⊢ (𝑛 = 𝑘 → (𝑥 ∈ ℂ ↦ (𝑥↑𝑛)) = (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)))
6	5	eleq1d 2303	. 2 ⊢ (𝑛 = 𝑘 → ((𝑥 ∈ ℂ ↦ (𝑥↑𝑛)) ∈ (𝐽 Cn 𝐽) ↔ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)))
7		oveq2 6066	. . . 4 ⊢ (𝑛 = (𝑘 + 1) → (𝑥↑𝑛) = (𝑥↑(𝑘 + 1)))
8	7	mpteq2dv 4206	. . 3 ⊢ (𝑛 = (𝑘 + 1) → (𝑥 ∈ ℂ ↦ (𝑥↑𝑛)) = (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1))))
9	8	eleq1d 2303	. 2 ⊢ (𝑛 = (𝑘 + 1) → ((𝑥 ∈ ℂ ↦ (𝑥↑𝑛)) ∈ (𝐽 Cn 𝐽) ↔ (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1))) ∈ (𝐽 Cn 𝐽)))
10		oveq2 6066	. . . 4 ⊢ (𝑛 = 𝑁 → (𝑥↑𝑛) = (𝑥↑𝑁))
11	10	mpteq2dv 4206	. . 3 ⊢ (𝑛 = 𝑁 → (𝑥 ∈ ℂ ↦ (𝑥↑𝑛)) = (𝑥 ∈ ℂ ↦ (𝑥↑𝑁)))
12	11	eleq1d 2303	. 2 ⊢ (𝑛 = 𝑁 → ((𝑥 ∈ ℂ ↦ (𝑥↑𝑛)) ∈ (𝐽 Cn 𝐽) ↔ (𝑥 ∈ ℂ ↦ (𝑥↑𝑁)) ∈ (𝐽 Cn 𝐽)))
13		exp0 10932	. . . 4 ⊢ (𝑥 ∈ ℂ → (𝑥↑0) = 1)
14	13	mpteq2ia 4201	. . 3 ⊢ (𝑥 ∈ ℂ ↦ (𝑥↑0)) = (𝑥 ∈ ℂ ↦ 1)
15		expcn.j	. . . . . . 7 ⊢ 𝐽 = (TopOpen‘ℂfld)
16	15	cnfldtopon 15534	. . . . . 6 ⊢ 𝐽 ∈ (TopOn‘ℂ)
17	16	a1i 9	. . . . 5 ⊢ (⊤ → 𝐽 ∈ (TopOn‘ℂ))
18		1cnd 8306	. . . . 5 ⊢ (⊤ → 1 ∈ ℂ)
19	17, 17, 18	cnmptc 15276	. . . 4 ⊢ (⊤ → (𝑥 ∈ ℂ ↦ 1) ∈ (𝐽 Cn 𝐽))
20	19	mptru 1407	. . 3 ⊢ (𝑥 ∈ ℂ ↦ 1) ∈ (𝐽 Cn 𝐽)
21	14, 20	eqeltri 2307	. 2 ⊢ (𝑥 ∈ ℂ ↦ (𝑥↑0)) ∈ (𝐽 Cn 𝐽)
22		oveq1 6065	. . . . . 6 ⊢ (𝑥 = 𝑛 → (𝑥↑(𝑘 + 1)) = (𝑛↑(𝑘 + 1)))
23	22	cbvmptv 4211	. . . . 5 ⊢ (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1))) = (𝑛 ∈ ℂ ↦ (𝑛↑(𝑘 + 1)))
24		id 19	. . . . . . 7 ⊢ (𝑛 ∈ ℂ → 𝑛 ∈ ℂ)
25		simpl 109	. . . . . . 7 ⊢ ((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) → 𝑘 ∈ ℕ0)
26		expp1 10935	. . . . . . . 8 ⊢ ((𝑛 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → (𝑛↑(𝑘 + 1)) = ((𝑛↑𝑘) · 𝑛))
27		expcl 10946	. . . . . . . . 9 ⊢ ((𝑛 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → (𝑛↑𝑘) ∈ ℂ)
28		simpl 109	. . . . . . . . 9 ⊢ ((𝑛 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → 𝑛 ∈ ℂ)
29	27, 28	mulcld 8310	. . . . . . . . 9 ⊢ ((𝑛 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → ((𝑛↑𝑘) · 𝑛) ∈ ℂ)
30		oveq1 6065	. . . . . . . . . 10 ⊢ (𝑢 = (𝑛↑𝑘) → (𝑢 · 𝑣) = ((𝑛↑𝑘) · 𝑣))
31		oveq2 6066	. . . . . . . . . 10 ⊢ (𝑣 = 𝑛 → ((𝑛↑𝑘) · 𝑣) = ((𝑛↑𝑘) · 𝑛))
32		eqid 2234	. . . . . . . . . 10 ⊢ (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣)) = (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))
33	30, 31, 32	ovmpog 6196	. . . . . . . . 9 ⊢ (((𝑛↑𝑘) ∈ ℂ ∧ 𝑛 ∈ ℂ ∧ ((𝑛↑𝑘) · 𝑛) ∈ ℂ) → ((𝑛↑𝑘)(𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))𝑛) = ((𝑛↑𝑘) · 𝑛))
34	27, 28, 29, 33	syl3anc 1274	. . . . . . . 8 ⊢ ((𝑛 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → ((𝑛↑𝑘)(𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))𝑛) = ((𝑛↑𝑘) · 𝑛))
35	26, 34	eqtr4d 2270	. . . . . . 7 ⊢ ((𝑛 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → (𝑛↑(𝑘 + 1)) = ((𝑛↑𝑘)(𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))𝑛))
36	24, 25, 35	syl2anr 290	. . . . . 6 ⊢ (((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) ∧ 𝑛 ∈ ℂ) → (𝑛↑(𝑘 + 1)) = ((𝑛↑𝑘)(𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))𝑛))
37	36	mpteq2dva 4205	. . . . 5 ⊢ ((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) → (𝑛 ∈ ℂ ↦ (𝑛↑(𝑘 + 1))) = (𝑛 ∈ ℂ ↦ ((𝑛↑𝑘)(𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))𝑛)))
38	23, 37	eqtrid 2279	. . . 4 ⊢ ((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) → (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1))) = (𝑛 ∈ ℂ ↦ ((𝑛↑𝑘)(𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))𝑛)))
39	16	a1i 9	. . . . 5 ⊢ ((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) → 𝐽 ∈ (TopOn‘ℂ))
40		oveq1 6065	. . . . . . 7 ⊢ (𝑥 = 𝑛 → (𝑥↑𝑘) = (𝑛↑𝑘))
41	40	cbvmptv 4211	. . . . . 6 ⊢ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) = (𝑛 ∈ ℂ ↦ (𝑛↑𝑘))
42		simpr 110	. . . . . 6 ⊢ ((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) → (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽))
43	41, 42	eqeltrrid 2322	. . . . 5 ⊢ ((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) → (𝑛 ∈ ℂ ↦ (𝑛↑𝑘)) ∈ (𝐽 Cn 𝐽))
44	39	cnmptid 15275	. . . . 5 ⊢ ((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) → (𝑛 ∈ ℂ ↦ 𝑛) ∈ (𝐽 Cn 𝐽))
45	15	mpomulcn 15560	. . . . . 6 ⊢ (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣)) ∈ ((𝐽 ×t 𝐽) Cn 𝐽)
46	45	a1i 9	. . . . 5 ⊢ ((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) → (𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣)) ∈ ((𝐽 ×t 𝐽) Cn 𝐽))
47	39, 43, 44, 46	cnmpt12f 15280	. . . 4 ⊢ ((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) → (𝑛 ∈ ℂ ↦ ((𝑛↑𝑘)(𝑢 ∈ ℂ, 𝑣 ∈ ℂ ↦ (𝑢 · 𝑣))𝑛)) ∈ (𝐽 Cn 𝐽))
48	38, 47	eqeltrd 2311	. . 3 ⊢ ((𝑘 ∈ ℕ0 ∧ (𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽)) → (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1))) ∈ (𝐽 Cn 𝐽))
49	48	ex 115	. 2 ⊢ (𝑘 ∈ ℕ0 → ((𝑥 ∈ ℂ ↦ (𝑥↑𝑘)) ∈ (𝐽 Cn 𝐽) → (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1))) ∈ (𝐽 Cn 𝐽)))
50	3, 6, 9, 12, 21, 49	nn0ind 9713	1 ⊢ (𝑁 ∈ ℕ0 → (𝑥 ∈ ℂ ↦ (𝑥↑𝑁)) ∈ (𝐽 Cn 𝐽))

Syntax hints:   → wi 4   ∧ wa 104   = wceq 1398  ⊤wtru 1399   ∈ wcel 2205   ↦ cmpt 4176  ‘cfv 5357  (class class class)co 6058   ∈ cmpo 6060  ℂcc 8141  0cc0 8143  1c1 8144   + caddc 8146   · cmul 8148  ℕ₀cn0 9516  ↑cexp 10927  TopOpenctopn 13540  ℂ_fldccnfld 14833  TopOnctopon 15004   Cn ccn 15179   ×_t ctx 15246

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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4230  ax-sep 4233  ax-nul 4241  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-iinf 4715  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-mulrcl 8242  ax-addcom 8243  ax-mulcom 8244  ax-addass 8245  ax-mulass 8246  ax-distr 8247  ax-i2m1 8248  ax-0lt1 8249  ax-1rid 8250  ax-0id 8251  ax-rnegex 8252  ax-precex 8253  ax-cnre 8254  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257  ax-pre-apti 8258  ax-pre-ltadd 8259  ax-pre-mulgt0 8260  ax-pre-mulext 8261  ax-arch 8262  ax-caucvg 8263

This theorem depends on definitions:  df-bi 117  df-stab 839  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-if 3625  df-pw 3676  df-sn 3700  df-pr 3701  df-tp 3702  df-op 3703  df-uni 3920  df-int 3955  df-iun 3998  df-br 4115  df-opab 4177  df-mpt 4178  df-tr 4214  df-id 4419  df-po 4422  df-iso 4423  df-iord 4492  df-on 4494  df-ilim 4495  df-suc 4497  df-iom 4718  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-isom 5366  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-1st 6347  df-2nd 6348  df-recs 6549  df-frec 6635  df-map 6897  df-sup 7288  df-inf 7289  df-pnf 8326  df-mnf 8327  df-xr 8328  df-ltxr 8329  df-le 8330  df-sub 8463  df-neg 8464  df-reap 8867  df-ap 8874  df-div 8967  df-inn 9258  df-2 9316  df-3 9317  df-4 9318  df-5 9319  df-6 9320  df-7 9321  df-8 9322  df-9 9323  df-n0 9517  df-z 9598  df-dec 9731  df-uz 9875  df-q 9973  df-rp 10008  df-xneg 10127  df-xadd 10128  df-fz 10365  df-seqfrec 10837  df-exp 10928  df-cj 11555  df-re 11556  df-im 11557  df-rsqrt 11711  df-abs 11712  df-struct 13301  df-ndx 13302  df-slot 13303  df-base 13305  df-plusg 13390  df-mulr 13391  df-starv 13392  df-tset 13396  df-ple 13397  df-ds 13399  df-unif 13400  df-rest 13541  df-topn 13542  df-topgen 13560  df-psmet 14820  df-xmet 14821  df-met 14822  df-bl 14823  df-mopn 14824  df-fg 14826  df-metu 14827  df-cnfld 14834  df-top 14992  df-topon 15005  df-topsp 15025  df-bases 15037  df-cn 15182  df-cnp 15183  df-tx 15247  df-xms 15333  df-ms 15334

This theorem is referenced by:  plycn  15756